The seventh lecture in the module Particle Technology, delivered to second year students who have already studied basic fluid mechanics.
Centrifugal Separation covers both sedimenting and filtering centrifuges as well as hydrocyclones. Adaptation of the gravity settling and conventional filtration models, to account for the conceptual centrifugal acceleration, is included. Examples of industrial equipment for centrifugal separation are included.
Guía del alumno N° 5 El fin de la guerra y sus consecuencias
Material desarrollado Por Diego Andrés Rojas González, Estudiante de Pedagogía en Historia Geografía y Ed. Cívica. Como parte de la propuesta didáctica para alcanzar el grado del licenciado en educación, de la Universidad de las Américas, Viña del Mar, Chile
The seventh lecture in the module Particle Technology, delivered to second year students who have already studied basic fluid mechanics.
Centrifugal Separation covers both sedimenting and filtering centrifuges as well as hydrocyclones. Adaptation of the gravity settling and conventional filtration models, to account for the conceptual centrifugal acceleration, is included. Examples of industrial equipment for centrifugal separation are included.
Guía del alumno N° 5 El fin de la guerra y sus consecuencias
Material desarrollado Por Diego Andrés Rojas González, Estudiante de Pedagogía en Historia Geografía y Ed. Cívica. Como parte de la propuesta didáctica para alcanzar el grado del licenciado en educación, de la Universidad de las Américas, Viña del Mar, Chile
Experimental investigation on natural convection heat transfer augmentation w...sudhakarbammidi
The usual conventional fluids like H2O, engine oil, kerosene, ethanol, and ethylene glycol have lower thermal potential analysis to solids. Lower melting conductivity of fluid became an obstacle to use in distinctive utilization. The observations were carried out to obtain the increase in heat transfer rates as an outcome of mechanical vibrations enforced to a horizontal cylinder. The two cylindrical diameters are one in which external diameter 25cm and internal diameter is 12cm is heated inside the brass cylindrical surfaces. A Thermal layer was recognized outside the boundary layer in the ambient fluid later the study-state condition is obtain as the fluid temperature goes on increasing along an axial direction with Temperature variation of the cylinder along an axial direction. Preliminary carried out different heat inputs 30w, 40w, 50w, 60w and an interrelationship between the Nusselt numbers (Nu) for perpetual heat flux. The cylindrical surface is various vibrating frequencies 190 Hz, 160 Hz, 130 Hz, and 100 Hz. A range of amplitude, frequency, temperature difference and it is observed that amplitude length 0.5 amps. The vibration local heat transfer coefficient increases with linearly and Nusselt number increases from the bottom location to the top location.
Effect of Geometric Modifications on the Performance of Vortex Tube - A ReviewIJERA Editor
The vortex tube is device, which produces hot and cold air streams simultaneously at its two ends from a source
of compressed air without any moving part. Literature review of this paper is to understand the effect of various
parameters like inlet pressure of air, number of nozzles, cold orifice diameter and hot end valve angle on the
performance of vortex tube. Also by the literature review it is clear that there is no theory so perfect, which
gives the satisfactory explanation of the vortex tube phenomenon. Due to this reason researcher conduct the
series of experimentation to understand the effect of various parameters mentioned above on the performance of
vortex tube.
Analysis of cross flow induced vibration in an inline and staggered configura...eSAT Journals
Abstract
In many engineering applications like heat exchanger, radiator, evaporator, nuclear power plant and thermal power plant, arrangement of tubes is very crucial. Fluid elastic instability forms the basis for deciding the type of arrangement and tube spacing but the phenomenon of vortex induced vibration is random in nature. Tube spacing also plays a critical role in different types of arrangement. Different type of application requires different tube spacing and the range of tube spacing vary from 1 to 6. Vortex Induced Vibration in cross flow around the inline and staggered arrangement of the tube arrays is experimentally studied for varying P/d (tube spacing) ratio. It is observed that with the increase in the velocity, the amplitude displacement increases. As the amplitude displacement of the tube reduces, the pitch over diameter ratio is increased from 2 to 4. It is also observed that between inline and staggered arrangement, the amplitude displacement of staggered arrangement is more compared to inline arrangement for same tube spacing.
Keywords: Vortex Induced Vibration, Inline Arrangement, Staggered Arrangement, Regression Analysis
Heat Transfer Enhancement of Shell and Tube Heat Exchanger Using Conical Tapes.IJERA Editor
This paper provides heat transfer and friction factor data for single -phase flow in a shell and tube heat exchanger fitted with a helical tape insert. In the double concentric tube heat exchanger, hot air was passed through the inner tube while the cold water was flowed through the annulus. The influences of the helical insert on heat transfer rate and friction factor were studied for counter flow, and Nusselt numbers and friction factor obtained were compared with previous data (Dittus 1930, Petukhov 1970, Moody 1944) for axial flows in the plain tube. The flow considered is in a low Reynolds number range between 2300 and 8800. A maximum percentage gain of 165% in heat transfer rate is obtained for using the helical insert in comparison with the plain tube.
A Review on Comparison between Shell And Tube Heat Exchanger And Helical Coil...ijiert bestjournal
The curved shape of the tube causes the flowing fluid to experience centrifugal force. The
extent of centrifugal force experienced depends on the local axial velocity of the fluid particle
and radius of curvature of the coil. The fluid particles flowing at the core of the pipe have
higher velocities than those flowing near to the pipe wall. Thus the fluid particles flowing
close to the tube wall experience a lower centrifugal force than the fluid particles flowing in
the tube core. This causes the fluid from the core region to be pushed towards the outer wall.
This stream bifurcates at the wall and drives the fluid towards the inner wall along the tube
periphery, causing generation of counter-rotating vortices called secondary flows which
produce additional transport of the fluid over the cross section of the pipe. This additional
convective transport increases heat transfer and the pressure drop when compared to that in a
straight tube.
The dependencies of total pressure, velocity, vorticity, turbulent length, turbulent dissipation, turbulent viscosity, turbulent energy and turbulent time of moving fluid from a straight pipe length of a circular cross section are presented in graphical and mathematical forms. Changing analysis of considered parameters was performed at mass flow rates of 0.45, 1.0 and 1.5 kg/s. A transition boundary of laminar flow of fluid to turbulent flow is at the distance of 2/5 of length from the inlet of the pipe (at accepted total length of the pipe of 1000 mm).
Effect of Radiation on Mixed Convection Flow of a Non-Newtonian Nan fluid ove...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
#vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore#blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #blackmagicforlove #blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #Amilbabainuk #amilbabainspain #amilbabaindubai #Amilbabainnorway #amilbabainkrachi #amilbabainlahore #amilbabaingujranwalan #amilbabainislamabad
Design and Analysis of Algorithms-DP,Backtracking,Graphs,B&B
1 s2.0-s1875389210007522-main
1. Physics Procedia 00 (2010) 000 000
www.elsevier.com/locate/procedia
12th International Conference on Magnetic Fluids
Experimental Study on Micropump using Reciprocating Motion of
Magnetic Ball Covered with Magnetic Fluid
Hiroshige Kumamarua,
*, Satoshi Okamotoa
, Koki Arimotoa
,
Kazuhiro Itoha
and Yuji Shimogonyaa
1
a
University of Hyogo, 2167 Shosha, Himeji, Hyogo, 671-2280, Japan
Elsevier use only: Received 30 January 2010; revised 21 June 2010; accepted 11 April 2010
Abstract
A micropump combining reciprocating motion of a magnetic ball covered with magnetic fluid and diffusers working as valves
was investigated experimentally in this study. The reciprocating motion of the magnetic substance pushes water in order to
transport it. The diffusers with different divergence angles serve to pump water in net one direction. In the present micropump
experiments, the maximum flow rate achieved with minimum backpressure was 3.89 l/min and the maximum pressure head
achieved was 42.4 mm water.
Keywords: Micropump; Magnetic Ball; Magnetic Fluid; Maximum Flow Rate; Maximum Pressure Head
1. Introduction
In recent years, a variety of microfluidic devices are developed for a wide range of application, from chemical
analysis systems to actuating systems in medicine and biology. Many researchers have tried to develop micropumps
to be applied to microfluidic devices based on various principles and methods. Among them, diaphragm and
electroosmotic micropumps are at the stage of practical application in some degree. However, there still remains
problems in both micropumps; for examples, endurance of moving parts in check valves and relatively large pump
size for the former, and limitation of pumped fluid only to electrolyte solution and bubble generation in the pump for
the latter.
A few researchers have made efforts to carry experiments for micropumps using magnetic fluid or magnetic
materials. Hatch et al. proposed a micropump using rotating motion of magnetic fluid shown in Fig. 1 [1]. The
magnetic fluid acts as both a valve and a piston. The magnetic fluid valve, held in place by a stationary magnet, is
always present in the short section of channel between the inlet and outlet of the pumping loop. The magnetic fluid
plug serving as a piston is drawn around the loop by a rotating magnetic field. As the mobile plug is drawn around
the loop, water is drawn into the loop through the inlet, and forced out through the outlet. The maximum flow rate
* Corresponding author. Tel.: 81-79-267-4833 ; fax: 81-79-267-4833 .
E-mail address: kumamaru@eng.u-hyogo.ac.jp .
c 2010 Published by Elsevier Ltd
Physics Procedia 9 (2010) 238–242
www.elsevier.com/locate/procedia
1875-3892 c 2010 Published by Elsevier Ltd
doi:10.1016/j.phpro.2010.11.053
Open access under CC BY-NC-ND license.
Open access under CC BY-NC-ND license.
2. Hiroshige Kumamaru/ Physics Procedia 00 (2010) 000 000
achieved was 45.8 l/min and the maximum pressure head achieved was 135 mm water. However, the pump could
not get rid of the disadvantage caused by the channel contamination from the magnetic fluid and effluence of the
magnetic fluid.
Kim et al. proposed a peristaltic micropump using magnetic fluid shown in Fig. 2 [2]. Diaphragm between upper
and lower channels is made of silicon rubber. Collected magnetic fluid lump in the lower channel deforms the
silicon rubber diaphragm and then the deformed diaphragm pushes water in the upper channel. The maximum flow
rate was 3.8 l/min, however, the maximum pressure head is not shown in their paper.
In this study, a micropump combining reciprocating motion of a magnetic ball covered with magnetic fluid and
diffusers working as valves has been proposed and investigated experimentally.
Fig. 1 Hatch et al. s Micropump
Fig. 2 Kim et al. s Micropump
H. Kumamaru et al. / Physics Procedia 9 (2010) 238–242 239
3. Hiroshige Kumamaru/ Physics Procedia 00 (2010) 000 000
2. Experiments
Figure 3 explains the working principle of the present micropump. The magnet ball covered with magnetic fluid
serves as a piston, preventing the effluence of magnetic fluid observed in Hatch et al s micropump. The magnetic
fluid covering the magnetic ball seals the space between magnetic ball and square channel wall. The diffuser
(convergence/divergence nozzle) works as a valve. For the divergence, the loss coefficient for a divergence angle of
~6 degree is minimum, 0.15, and the loss coefficient for angles greater than ~40 degree is ~1.0. For the convergence,
the loss coefficient is very small, ~0, for all angles.
When the magnet ball in the pumping channel moves toward this side by the permanent magnet, the water
(pumped fluid) is transported toward left side in the micro channels (Fig. 3(a)). When the magnet ball moves
toward opposite side, the water is also transported mainly toward left side (Fig. 3(b)).
The pumping channel is 3.4 mm in width, 3.5 mm in depth and approximately 40 mm in length. The micro
channels except for the pumping channel are 1 mm in width and 0.5 mm in depth. The diffusers are
approximately 6 mm in length having divergence angles 6 and 127 degrees. The upper and lower plates of the
micropump are made of acryl. The flow channels are fabricated on the lower plate by cutting with end mills. The
upper and lower plates are attached by burning in an electric furnace at 140 C during 2 hours. The magnet ball is a
neodymium magnet plated with nickel with a diameter of 3 mm and a magnetic flux density of 320 mT.
(a)
(b)
Fig. 3 Present Micropump
240 H. Kumamaru et al. / Physics Procedia 9 (2010) 238–242
4. Hiroshige Kumamaru/ Physics Procedia 00 (2010) 000 000
Figure 4 shows the experimental apparatus. Two cylindrical containers are connected to the inlet and outlet of the
micropump in order to measure the flow rate and pressure head. The permanent magnet is put into reciprocating
motion by an electromotive slider and a stepping motor. The permanent magnet is a neodymium magnet with a
diameter of 10 mm and a thickness of 5 mm, and a magnetic flux density of 350 mT
3. Experimental Results
The stroke of the reciprocating motion of permanent magnet is 30 mm and the frequency of it is 0.5 1/s (CASE1)
and 0.25 1/s (CASE2). Two kinds of magnetic fluids covering the magnetic ball are used, N-304 (medium=
isoparaffin, magnetization= 33 mT, viscosity= 10 mPas, specific gravity= 1.14) and N-504 (medium= isoparaffin,
magnetization= 55 mT, viscosity= 22 mPas, specific gravity= 1.40).
Figure 5 shows total pumped water (i.e. integrated water flow rate) versus elapsed time. The total pumped water
became considerably larger for the combination of CASE1 (0.5 1/s) and N504 (larger viscosity) than for the other
combinations.
Figure 6 shows pump pressure head versus flow rate. The pump pressure head and flow rate were also
considerably larger for the combination of CASE1 and N504 than for the other combinations. The maximum flow
rate achieved with minimum backpressure was 3.89 l/min and the maximum pressure head achieved was 42.4 mm
water.
Fig. 4 Experimental Apparatus
6 12 18 24 30
500
1000
1500
2000
2500
3000
0
T (hour)
Qtotal
:CASE1-N504
:CASE1-N304
:CASE2-N504
:CASE2-N304
Fig. 5 Total Pumped Water versus Time
H. Kumamaru et al. / Physics Procedia 9 (2010) 238–242 241
5. Hiroshige Kumamaru/ Physics Procedia 00 (2010) 000 000
4. Conclusions
In the present micropump experiments, the maximum flow rate achieved with minimum backpressure was 3.89
l/min and the maximum pressure head achieved was 42.4 mm water. In future, it is desirable to replace the
diffusers by passive valves in order to improve the pump performance.
References
[1] A. Hatch, A.E. Kamholz, G. Holman, P. Yager, K.F. Bohringer, A Ferrofluidic Magnetic Micropump, J. of
Microelectromechanical Systems, 10 (2) (2001) 215-221.
[2] E.G. Kim, J.-G. Oh, B. Choi, A Study on The Development of A Continuous Peristaltic Micropump using
Magnetic Fluids, Sensors and Actuators A, 128 (2006) 43-51.
1 2 3 4
10
20
30
40
50
0
Q in)
H(mm)
:CASE1-N504
:CASE1-N304
:CASE2-N504
:CASE2-N304
Fig. 6 Pressure Head versus Flow Rate
242 H. Kumamaru et al. / Physics Procedia 9 (2010) 238–242