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 1.63P: 1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical...

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1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
A technique for measuring convection heat transfer coefficients involves bonding one surface of a thin metallic foil to an insulating material and exposing the other surface to the fluid flow conditions of interest. L Th = Foil (Pelect T) Foam Insulation (k) -Ть By passing an electric current through the foil, heat is dissipated uniformly within the foil and the corresponding flux, Pee may be inferred from related voltage and current measurements. If the insulation thickness Land thermal conductivity k are known and the fluid, foil, and insulation temperatures (T., Ts, T₁) are measured, the convection coefficient may be determined. Consider conditions for which T = T = 25°C, P =2200 W/m², L = 10 mm, and k = 0.040 W/m.K. elec (a) With water flow over the surface, the foil temperature measurement yields T, = 27°C. Determine the convection coefficient, in W/m²K. What error, in percent of this value, would be incurred by assuming all of the dissipated power to be transferred to the water…
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(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 (Pelec 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 T0 = 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…
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