If Prandtl number, Pr= 0.72,determine the flow Reynolds number. Wind flows over a flat plate of lengthL = 25 mm and width W = 8 mm. Theplate is maintained at a constanttemperature of 32 °C on both sidesusing an electric heater generatingheat at a rate of Q = 0.5 W which isdissipated to air from both sides ofthe plate. Consider the temperature ofthe wind/air as 20 °C and assume thatthe wind speed does not exceed 100m/s.The properties of air at thistemperature are given as; specificheat capacity Cp = 1.005 kJ/kg-K,thermal conductivity k = 0.0253W/m-K, Density p = 1.19 kg/m³, andkinematic viscosity v = 1.522 x 105 m²/s.

Given data Length of plate = L = 25 mm = 0.025 m Width of plate = W = 8 mm = 0.08 m Temperature of…

Answered: If Prandtl number, Pr= 0.72, determine…

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If Prandtl number, Pr= 0.72, determine the flow Reynolds number.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.65P

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

If Prandtl number, Pr= 0.72,
determine the flow Reynolds number.

Wind flows over a flat plate of length
L = 25 mm and width W = 8 mm. The
plate is maintained at a constant
temperature of 32 °C on both sides
using an electric heater generating
heat at a rate of Q = 0.5 W which is
dissipated to air from both sides of
the plate. Consider the temperature of
the wind/air as 20 °C and assume that
the wind speed does not exceed 100
m/s.
The properties of air at this
temperature are given as; specific
heat capacity Cp = 1.005 kJ/kg-K,
thermal conductivity k = 0.0253
W/m-K, Density p = 1.19 kg/m³, and
kinematic viscosity v = 1.522 x 10
5 m²/s.

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