By passing an electric current through the foil, heat is dissipated uniformly within the foil and the corresponding flux (P elec) may be inferred from related voltage and current measurements. Consider conditions for which To = Tb = 25°C, Pelec = 2000 W/m2, L = 7 mm, and k = 0.05 W/m.K. (1) With water flow over the surface, the foil temperature measurement yields Ts = 30°C. Determine the convection heat transfer coefficient for both cases below. The foil has an emissivity of 0.15 and is exposed to large surroundings at 25°C. (2) On the other hand, if air flows over the surface and the temperature measurement yields Ts 120°C, how the convection heat transfer coefficient will be different?

By passing an electric current through the foil, heat is dissipated uniformly within the foil and the corresponding flux (P elec) may be inferred from related voltage and current measurements. Consider conditions for which To = Tb = 25°C, Pelec = 2000 W/m2, L = 7 mm, and k = 0.05 W/m.K. (1) With water flow over the surface, the foil temperature measurement yields Ts = 30°C. Determine the convection heat transfer coefficient for both cases below. The foil has an emissivity of 0.15 and is exposed to large surroundings at 25°C. (2) On the other hand, if air flows over the surface and the temperature measurement yields Ts 120°C, how the convection heat transfer coefficient will be different?

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.4P: 1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus...

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Question

(B) In order to measure the convection heat transfer coefficients one of the common methods
involve bonding one surface of a thin metallic foil to an insulating material and exposing the other
surface to the fluid flow conditions of interest.
T, h
-Foil (Pälec T)
- Foam Insulation (k)
Figure1: Heat transfer direction
By passing an electric current through the foil, heat is dissipated uniformly within the foil and the
corresponding flux (P elec) may be inferred from related voltage and current measurements.
Consider conditions for which To = Tb = 25°C, Pelec = 2000 W/m2, L = 7 mm, and k = 0.05
W/m.K.
(1) With water flow over the surface, the foil temperature measurement yields Ts= 30°C. Determine
the convection heat transfer coefficient for both cases below. The foil has an emissivity of 0.15 and
is exposed to large surroundings at 25°C.
(2) On the other hand, if air flows over the surface and the temperature measurement yields Ts =
120°C, how the convection heat transfer coefficient will be different?

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