Chapter 8: Internal Forced Convection

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– HydrodynamicLaminar flowLh,laminar≈0.05Re⋅D– ThermalL ≈ 0.05Re⋅Pr⋅ D= Pr⋅Lt,laminarh,laminar
Developing Laminar Flow in the Entrance Region• For a circular tube of length L subjected to constantsurface temperature, the average Nusselt number forthe thermal entrance region (hydrodynamicallydeveloped flow)0.065( DL)Re⋅PrNu = 3.66 +1+ 0.04⎡⎣( DL)Re⋅Pr⎤⎦• For flow between isothermal parallel plates23(8-62)Nu= 7.54 +0.03 D L Re⋅Pr( )h1+ 0.016⎡⎣( D ) hL Re⋅Pr⎤⎦23(8-64)
Page 1: Chapter 8:Internal Forced Convectio
Page 4 and 5: Average Velocity• The value of th
Page 6 and 7: • For incompressible flow in a ci
Page 8 and 9: The Entrance Region• A fluid ente
Page 10 and 11: Thermal Entrance Region• Consider
Page 12 and 13: • Surface heat flux can be expres
Page 14 and 15: Entry Lengths ()- HydrodynamicLamin
Page 16 and 17: General Thermal Analysis• In the
Page 18 and 19: • In the fully developed region,
Page 20 and 21: Constant Surface Temperature• The
Page 22 and 23: • The temperature difference betw
Page 24 and 25: Laminar Flow in TubesAssumptions:
Page 26 and 27: • Taking the limit as dr, dx 0 g
Page 28 and 29: • Combining the last two equation
Page 30 and 31: • A pressure drop due to viscous
Page 32 and 33: • Or∂T1 ∂Qu =−( )∂ x ρc
Page 34 and 35: • Separating the variables and in
Page 36 and 37: Constant Surface temperature (circu
Page 40 and 41: Turbulent flow in Tubes• Most cor
Page 42: Moody Diagram

Chapter 8: Internal Forced Convection

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