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1. ROOT BLOWERS

2. Team members
◦ 21M211 GANESHKISHORE. A
◦ 21M208 CHANDRU.V
◦ 21M220 KARTHIKEYAN.C
◦ 21M225 MHONISKHAR .K

3. INTRODUCTION
◦ Blowers are usually air-cooled and oil-free
◦ Their low efficiency limits these blowers to very low-pressure applications and
compression in a single stage, even if two- and three-stage versions are available.
◦ Roots blowers are frequently used as vacuum pumps and for pneumatic
conveyance.
◦ Roots blower is a valve-less displacement compressor without internal
compression.
◦ Roots efficiency is defined as the ratio of isentropic work done to actual work done
and it is given by,
◦

4. Construction and Working of
Root Blowers :
◦ The two-lobe type roots blower is shown in Fig. One of the rotors is connected to
an external drive and the second rotor is driven from the first
◦ The lobes of the rotors are of cycloid or involute form giving correct mating to seal
the delivery side from the inlet side.
◦ The high-pressure delivery side is sealed from the low-pressure suction side at all
angular positions and this sealing continues until delivery commences.
◦ To reduce wear, a small clearance ( 0.01 cm to 0.02 cm) is provided between the
lobes and casing.
◦ Theoretically, there should be no pressure rise; because the flow area does not
decrease from inlet to exit.
◦ But when the outlet port opens, the high-pressure air in the receiver offers
resistance to the delivery of blower discharge causing in instantaneous irreversible
pressure rise.

5. Applications of Root Blowers :
◦ Electrolytic Tank – Deliver air into the electrolytic tank so as to circulate the
electrolyte for achieving better plating quality.
◦ Paper Feeding for Printer – For paper segregation, paper handling, and paper
feeding
◦ Cleaning the Piping – To blow out dust or metal from the piping, so as to keep
the piping clean.
◦ Drying the Conveyer Belt – For drying small conveyor belts.
◦ Wastewater Treatment – Stirring the sediment, or purification of a water
treatment plant.
◦ Scavenging and supercharging of I.C. Engines.

6. Advantages of Root Blowers :
◦ It has only two moving parts (i.e two rotors) which are identical in shape and size.
◦ Its operation is entirely rotary.
◦ As the rotors are symmetric about their center of rotation, the operation
is dynamical balanced.
◦ Discharge of the compressed gas is complete and there is no clearance volume.

7. Roots-Blower Disadvantages
◦ In the range of partial load, the conveying speed is higher, i.E. Wear on the
conveyor pipe and breakage of the conveying material will be greater.
◦ A conveying speed once chosen can only be altered with considerable expenditure.
◦ Due to the low-frequency noises (pulsating conveying airflow), expensive noise
dampening equipment will be necessary.
◦ In order not to exceed the operating pressures, a control device must be installed;
on account of the narrow piston clearance.
◦ The roots-blower is sensitive to foreign matter, i.E., Filter cleaning of the conveying
air is required
◦ After a longer period of use, the piston clearance becomes larger and leads to
capacity losses.

8. Root blower Compressor
Diagram :

9. PV DIAGRAM

10. Efficiency of Roots blower

11. High speed infrared thermography
◦ Developed thermo-mechanical model produces results consistent with exp. measurements.
◦ Model enables the consideration of any type of spur gear tooth profile.
◦ High-speed thermography offers detailed insight into thermal response of polymer gears.
◦ Tooth flash temperature gradient quickly dissipates after meshing cycle completion.
◦ Geometric tolerance deviations influence the temperature rise on a given tooth pair.
◦ The thermal response of the considered gear pair is studied thoroughly from both the analytical
and experimental standpoints.
◦ The presented experimental approach also offers the possibility to observe the temperature rise
inside and outside the meshing cycle
◦ The specific constitutional behavior of thermoplastics influences the gear-meshing pattern,
which can deviate substantially from ideal gear meshing, as typically exhibited by metal gears in
moderate-loading conditions.

12. AXIAL GAP COLLIBRATION
◦ Before applying energy improvement strategies to real energy supply facilities, it is necessary to
have an accurate model of their dynamic energy behaviour in order to predict and optimize the
results.
◦ The methodology developed in this work overcomes the difficulties derived from the limited data
in the model design and calibration processes, resulting in a procedure that balances the little
available building information and the computational effort, with satisfactory results
◦ Therefore, it could be applicable in models with also high uncertainty and any facilities
configuration
◦ Understanding the behaviour of thermal systems is vital to making improvements and
optimizing control since, as time goes by, the components degrade and the interaction between
the different pieces of equipment varies

13. COMPUTATIONAL FLOW MODEL
aerodynamics of aircraft and vehicles: lift and drag
• hydrodynamics of ships
• power plant: combustion in internal combustion engines and gas
turbines
• turbomachinery: flows inside rotating passages, diffusers etc.
• electrical and electronic engineering: cooling of equipment including
microcircuits
• chemical process engineering: mixing and separation, polymer moulding

14. CONJUGATE HEAT TRANSFER
MODELLING
◦ Conjugate heat transfer is a type of heat transfer analysis between solids and fluid(s). This type of heat transfer
includes both convection (between fluids) and conductive (between solids) heat transfer, as well as both forced and
natural convection
◦ Conjugate heat transfer is observed in many situations. For example, heat sinks are optimized to combine heat
transfer by conduction in the heat sink with the convection in the surrounding fluid.
◦ The Conjugate Heat Transfer (CHT) analysis type allows for the simulation of heat transfer between solid and
fluid domains by exchanging thermal energy at the interfaces between them.
◦ Temperature is the driving force, entropy is the associated displacement, and the two form a pair of conjugate
variables. The temperature/entropy pair of conjugate variables is the only heat term; the other terms are
essentially all various forms of work.

15. Conclusion and overview
◦ The mechanism of heat transfer is explained by the first law of thermodynamics. This law states that energy can
neither be created or destroyed, only transferred between systems. Inevitably, when energy is transferred
between two systems some is lost to the surrounding environment.
◦ Overall heat transfer coefficient is a way of measuring the ability to sufficiently transfer heat through a series
of semiconducting and convection cooling barriers' . It is commonly used to determine heat transfer in heating
systems and heat pumps. , but it can also be used to solve other problems.
◦ Heat transfer has broad application to the functioning of numerous devices and systems. Heat-transfer principles
may be used to preserve, increase, or decrease temperature in a wide variety of circumstances.