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Real Life Heat Transfer Problems : Conjugate Heat Transfer

Real Life Heat Transfer Problems : Conjugate Heat Transfer. P M V Subbarao Professor Mechanical Engineering Department IIT Delhi. Togetherness is More Powerful ……. Solar Power Towers. Flexible Baked Filament-based polymer. Air Craft Window. T amb,o = -40 0 C. T amb,i = 22 0 C.

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Real Life Heat Transfer Problems : Conjugate Heat Transfer

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  1. Real Life Heat Transfer Problems : Conjugate Heat Transfer P M V Subbarao Professor Mechanical Engineering Department IIT Delhi Togetherness is More Powerful …….

  2. Solar Power Towers

  3. Flexible Baked Filament-based polymer Air Craft Window Tamb,o = -400C Tamb,i = 22 0C

  4. Surface Temperature Distributions

  5. qradiation qconvection qconduction qconduction qconvecrion qradiation qconvection Conjugate Heat Transfer Model

  6. Steam pipe Insulation Optimal Insulation for Steam Piping Tsteam Tpipe,in Steam Ambient Air Tpipe,out Design Confusion: Tinsulation,in Tinsulation,out Tair

  7. Cooling of Large Electric Motors

  8. Structure of Stator and Rotor Cores Stator Stator core Stator conductor Rotor Rotor cond. Air gap

  9. Structure of Core & Conductor Conductor coil bundle Laminated core

  10. Air flow & Convection Heat Transfer in Axial & Radial Ducts Air gap

  11. Air flow network Model of the air flow in the radial air-cooled induction motor.

  12. Simplified Air flow Network Fluid flow network diagram (simplified).

  13. Air flow in radial ducts and heat flow to air.

  14. HEAT TRANSFE IN TURNING • In recent years there has been a growing interest in modelling of metal cutting process. • It has been accompanied also by the interest in modelling of thermal behaviour of the workpiece. • Thermal expansion affects the machining accuracy, hence the latter interest can be attributed to the demand for higher accuracy and to the effort to improve the ability of its prediction.

  15. Heat Transfer in Turning

  16. Location of Thermocouples

  17. Temperature Distribution Without cooling Jet With Cooling Jet

  18. Electrical Circuit Theory of Heat Transfer • DefineThermal Resistance • A resistance can be defined as the ratio of a driving potential to a corresponding transfer rate. Analogy: Electrical resistance is to conduction of electricity as thermal resistance is to conduction of heat. The analog of Qis current, and the analog of the temperature difference, T1 - T2, is voltage difference. From this perspective the slab is a pure resistance to heat transfer and we can define

  19. Thermal Resistance for Radiation

  20. The composite Wall • The concept of a thermal resistance circuit allows ready analysis of problems such as a composite slab (composite planar heat transfer surface). • In the composite slab, the heat flux is constant with x. • The resistances are in series and sum to Rth = Rth1 + Rth2. • If TLis the temperature at the left, and TRis the temperature at the right, the heat transfer rate is given by

  21. T1 T2 Rconv,1 Rcond Rconv,2 Wall Surfaces with Convection

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