Air at 20°C flows over a plate which is at 80°C and temperature at a location of 0.5mm fromsurface is measured to be 50°C. Assuming themal conductivity of fluid as 0.025W/mK, thelocal convective heat transfer coefficient will be(A) 25W/ m²K(B) 30W / m²K(C) 35W/ m²K(D) 40 W / m²K

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Engineering

Mechanical Engineering

mal condu

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.38P

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Fluid Kinematics

The branch of science that deals with objects which are either in motion or stationary are studied under the branch of classical mechanics. Fluid mechanics is a subcategory of classical mechanics that deals with the behavior of fluids at rest (fluid statics) or in motion (posing some velocity). In fluid kinematics, studies focus on the associated motion of fluid particles or groups of particles, and its associated parameters like displacements, velocity, and acceleration without concerning about the forces that caused the motion. All the laws of classical mechanics are applied in the study of fluid kinematics.

Question

Air at 20°C flows over a plate which is at 80°C and temperature at a location of 0.5mm from
surface is measured to be 50°C. Assuming themal conductivity of fluid as 0.025W/mK, the
local convective heat transfer coefficient will be
(A) 25W/ m²K
(B) 30W / m²K
(C) 35W/ m²K
(D) 40 W / m²K

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