a) In a methanol production plant, process water at 30°C with a free stream velocity of 0.3 m/s flows over a 1m x1m flat plate. Temperature of flat plate is maintained at 10°C using other stream Freon R134-a which flow at inlet temperature 0°C and outlet temperate 5°C. Determine the i. hydrodynamic boundary layer thickness, ii. thermal boundary layer thickness, ii. local and average values of friction coefficient iv. local and average heat transfer coefficient vi. amount of Freon R134-a necessary to maintain the plate temperature (Cp Freon=1.3338 kJ/kg.K)
a) In a methanol production plant, process water at 30°C with a free stream velocity of 0.3 m/s flows over a 1m x1m flat plate. Temperature of flat plate is maintained at 10°C using other stream Freon R134-a which flow at inlet temperature 0°C and outlet temperate 5°C. Determine the i. hydrodynamic boundary layer thickness, ii. thermal boundary layer thickness, ii. local and average values of friction coefficient iv. local and average heat transfer coefficient vi. amount of Freon R134-a necessary to maintain the plate temperature (Cp Freon=1.3338 kJ/kg.K)
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 5.54P
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Question
HEAT TRANSFER
From the heat transfer property table of water, the properties at 20 0C are as follows:
Density = 997.36 kg/m3
Kinematic viscosity = 1.026 × 10-6 m2/s
Prandtl number = 7.17
(i) Thickness of hydrodynamic boundary layer = 9.24 mm
(ii) Thickness of thermal boundary layer = 4.79 mm
(iii)Local friction coefficient = 0.001228
Average friction coefficient = 0.002456
ANSWER QUESTION (iv) ,(vi) and B
Transcribed Image Text:a) In a methanol production plant, process water at 30°C with a free stream velocity of
0.3 m/s flows over a 1m x1m flat plate. Temperature of flat plate is maintained at
10°C using other stream Freon R134-a which flow at inlet temperature 0°C and outlet
temperate 5°C. Determine the
i. hydrodynamic boundary layer thickness,
ii. thermal boundary layer thickness,
i. local and average values of friction coefficient
iv. local and average heat transfer coefficient
vi. amount of Freon R134-a necessary to maintain the plate temperature
(Cp Freon=1.3338 kJ/kg.K)
b) Consider a concentric annulus of inner diameter D 2.5 cm and outer diameter D. 5
cm length is 6 m, Air (flow inside annulus) at 293 K 800kPa bar is chilled by concurrent
flow of melting ice (flow inside tube). Determine the exit temperatures of dry air if flow
rates of dry air at 7.5 kg/hr.
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