Heat transfer enhancement by nanofluid Suhail Patel
The purpose of this paper is to look into the present aspects of “Nanotechnology”. This gives a brief description of how heat transfer enhances using Nanofluid And its application in various fields viz. heat transportation, military applications, medical, etc. This paper focuses one explaining the basic mechanisms of improvement in heat transfer by addition nanoparticles.
Heat transfer enhancement by nanofluid Suhail Patel
The purpose of this paper is to look into the present aspects of “Nanotechnology”. This gives a brief description of how heat transfer enhances using Nanofluid And its application in various fields viz. heat transportation, military applications, medical, etc. This paper focuses one explaining the basic mechanisms of improvement in heat transfer by addition nanoparticles.
Draft Tube and Cavitation | Fluid MechanicsSatish Taji
Watch Video of this presentation on Link: https://youtu.be/OFIgUfclEHU
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For Video, Visit our YouTube Channel (link is given below).
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Nanofluids are now developing technology in main purpose heat transfer stream. In paper has brief information on the introduction and preparation methods of nanofluids. This paper prepared from the study of online resources
These slides use concepts (e.g., scaling) from my (Jeff Funk) course entitled analyzing hi-tech opportunities to analyze how membranes have and are becoming more economically feasible for one application, pervaporation. The economic feasibility of pervaporation is improved as temperatures and pressures of the systems are increased, which are facilitated by larger scale, and as the membranes are improved. Membranes become cheaper as they are made thinner (example of scaling) and they become better as the pore size is made both smaller and is designed for allowing specific molecules to pass through the pores.
Draft Tube and Cavitation | Fluid MechanicsSatish Taji
Watch Video of this presentation on Link: https://youtu.be/OFIgUfclEHU
For notes/articles, Visit my blog (link is given below).
For Video, Visit our YouTube Channel (link is given below).
Any Suggestions/doubts/reactions, please leave in the comment box.
Follow Us on
YouTube: https://www.youtube.com/channel/UCVPftVoKZoIxVH_gh09bMkw/
Blog: https://e-gyaankosh.blogspot.com/
Facebook: https://www.facebook.com/egyaankosh/
Nanofluids are now developing technology in main purpose heat transfer stream. In paper has brief information on the introduction and preparation methods of nanofluids. This paper prepared from the study of online resources
These slides use concepts (e.g., scaling) from my (Jeff Funk) course entitled analyzing hi-tech opportunities to analyze how membranes have and are becoming more economically feasible for one application, pervaporation. The economic feasibility of pervaporation is improved as temperatures and pressures of the systems are increased, which are facilitated by larger scale, and as the membranes are improved. Membranes become cheaper as they are made thinner (example of scaling) and they become better as the pore size is made both smaller and is designed for allowing specific molecules to pass through the pores.
Sua função é converter o combustível em vapor. Confira mais no link!
http://www.solucoesindustriais.com.br/empresa/maquinas-e-equipamentos/tec-calor/produtos/caldeiras/caldeira-industrial-1
La siguiente es una descripción del componente del poder, la economía y las organizaciones sociales en la prueba de Ciencias Sociales de la prueba Saber 11.
Apresenta três passagens de gases, e capacidade de 2.000 kg/h de vapor. Veja mais no link!
http://www.solucoesindustriais.com.br/empresa/maquinas-e-equipamentos/tec-calor/produtos/caldeiras/caldeira-a-vapor
Dimensional Effect on Engineering Systems & Clean Room & ClassificationSamiran Tripathi
The Presentation is divided in two halves: the first half is dimensional effect on engineering systems and the second half deals with the basics of clean room and its classification
Gas Chromatography is an analytical techniques, used for the separation of volatile substances on the basis of their partition coefficient . In this slide you will find out different instrumentation of gas chromatography, its advantages, disadvantages and moreover its applications.
Survey on Declining Curves of Unconventional Wells and Correlation with Key ...Salman Sadeg Deumah
The analysis of the decline curve is applied each year of production which gives the possibility to determine the average decline rate. The calculation of the correlation coefficient gives the possibility to link the different parameters.
1. MODELLING OF THERMOPHORESIS IN
MULTIPHASE FLOWS
Master's Thesis
Student: Andrés Gude Lustres
Study Program: Master of Industrial Engineering
Mentor: assoc. Prof. Dr. Jure Ravnik
Maribor 07.07.2016
3. OVERVIEW OF THE PROBLEM
• Researches into micro and nanoparticles.
• Significant progress in all branches of science.
• Thermophoresis one of most studied phenomena.
• Concern about climate change and pollution.
• Importance in numerous industrial processes.
• Examples: air cleaning, coal combustion, chemical
vapor deposition and microcontamination.
4. GOALS AND AIMS
• Analyze the behavior of thermophoresis on
microparticles and nanoparticles.
• Analyze multiphase fluids with the presence of
Brownian motion and thermophoresis.
• Analyze multiphase fluids only with the
presence of thermophoresis.
• Understand the relationship between the two
phenomena.
5. BROWNIAN MOTION
• Brownian motion is the random motion of
particles suspended in a fluid (liquid or gas)
resulting from their collision with the quick
atoms or molecules in the gas or liquid.
• Statistically independent successive
displacements.
• May be described by a force with random
components
6. Why the motion is caused?
• Small particles disperse faster in hotter
regions and slower in colder regions.
• The particle velocity in the hotter regions is
higher than in the colder regions.
• Particles collide and move toward the colder
region.
• The force that push them is the
thermophoretic force.
7. THERMOPHORESIS
• Consequence of the Brownian movement of
particles in fluids with an externally sustained and
constant temperature gradient.
• Is the migration of a particle away from the
higher-temperature region and toward the lower-
temperature region in large particles.
• Is the migration of a particle away from the
lower-temperature region and toward the higher-
temperature region in small particles.
• Is the average motion of the particles.
8. THERMOPHORESIS MODELS
• MODEL 1: Kn<2.
• MODEL 2: transition regime (0.2 < Kn < 10).
• MODEL 3: Kn>>1. For monoatomic gases.
• MODEL 4: entire range of small and larger Kn.
• MODEL 5: entire range of small and larger Kn.
• MODEL 6: entire range of small and larger Kn.
• MODEL 1,4,5: Dioctyl phthalate (DOP) droplets in
air, silicone oil in argon, tricresylphosphate in air.
• MODELS 2,3,6: for monatomic gases.
9. CHOSEN MODEL
• The mean free path of water is 2.5 angstrom.
• The characteristic length scale is 1 cm.
• Kn << 1.
• Continuum regime.
• Particles massless (as they are very small and
their Stokes number are very small, thus they
follow the fluid.)
• Drag, lift and gravity forces are neglected
• Particles have the same velocity as the fluid plus
Browninan and thermophoretic velocities.
13. DESCRIPTION OF THE MODEL
• A cubic cavity is filled with fluid and subjected to a
temperature difference on two opposite vertical sides.
• Constant temperature on two vertical walls.
• Zero heat flux on other four wall (adiabatic).
• Zero velocity on all walls (no-slip boundary condition).
14. DESCRIPTION OF THE MODEL
• In-houde CFD code, which uses Euler-Lagnrange
method to simulate flow and movement of
particles.
• 100.000 particles.
• 100 time steps .
• Ra = 1000, Ra = 10000, Ra = 100000; Ra =
1000000.
• 1º case: with thermophoresis.
• 2º case: with thermophoresis and Brownian
motion.
20. POSITION AND NUMBER OF PARTICLES
• For each Rayleigh number.
• The YZ plane is analyzed.
• X axis is analyzed.
• The X axis scale is from 0 [cm] to 1 [cm].
• The position 0 is the coldest side.
• The position 1 is the hottest side.
• Time steps intervals analyzed: 1st to the 10th, from
the 31st to the 40th, from the 61st to 70th, from the
91st to 100th.
21. POSITION AND NUMBER OF PARTICLES
• XZ plane and time step 50.
Ra = 1000 Ra = 10000
22. POSITION AND NUMBER OF PARTICLES
• XZ plane and time step 50.
Ra = 100000 Ra = 1000000
24. POSITION AND NUMBER OF PARTICLES
0
500
1000
1500
2000
2500
3000
0 0.05 0.1 0.15 0.2
N
X axis [cm]
t: 1-10 (Th+Bw)
t: 31-40 (Th+Bw)
t: 61-70 (Th+Bw)
t: 91-100 (Th+Bw)
0
500
1000
1500
2000
2500
3000
0.6 0.7 0.8 0.9 1
N
X axis [cm]
t: 1-10 (Th+Bw)
t: 31-40 (Th+Bw)
t: 61-70 (Th+Bw)
t: 91-100 (Th+Bw)
0
1
2
3
4
5
0 0.05 0.1 0.15 0.2
N
X axis [cm]
t: 1-10 (Th+Bw)
t: 31-40 (Th+Bw)
t: 61-70 (Th+Bw)
t: 91-100 (Th+Bw)
0
5000
10000
15000
20000
25000
30000
35000
0.6 0.7 0.8 0.9 1
N
X axis [cm]
t: 1-10 (Th+Bw)
t: 31-40 (Th+Bw)
t: 61-70 (Th+Bw)
t: 91-100 (Th+Bw)
Ra=1.000Ra=1.000.000
25. HEAT FLUX
• Heat transfer though a vertical wall expressed
as Nusselt number versus time.
• For four different Rayleigh numbers.
• Thermophoresis (Th) case and
thermophoresis and Brownian motion
(Th+Bw) case are analyzed.
28. CONCLUSIONS
• Fluid temperature is the same in both cases.
• Fluid velocity: the flow is stronger and this is
moved over the external faces of the XY plane
due to vorticity.
• Fluid velocity: the effect of Brownian motion is
irrelevant.
• Position and number of particles: the effect of
Brownian motion is irrelevant.
• Heat flux: the effect of Brownian motion is
irrelevant.