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How much steam at 120°C is needed to change 1kg of ice at -10°C to water at 10°C?
A wall is made from an inhomogeneous (nonuniform) material for which the thermal conductivity varies through the thickness according to k = ax +b, where a and b are constants. The heat flux, q” is known to be constant.a) Determine expressions for the temperature gradient and the temperature distribution if the surface at x= 0 is temperature T1. b) If the values are given as a = 50 , b= 200 , q” =1200 , T1= 500 K and 0...
Consider a spherical container of inner radius r1, outer radius r2, and thermal conductivity k. Express the boundary condition on the inner surface of thecontainer for steady one-dimensional conduction for the following cases:(i) specified temperature of 50°C,[2 Marks](ii) specified heat flux of 45 W/m2 toward the center,[2 Marks](iii) convection to a medium at T∞ with a heat transfer coefficient of h.[2 Marks]
A 10 m long and 10 mm inner diameter pipe made of commercial steel (roughness height = 0.046 mm) is used to heat a liquid in an industrial process. The liquid enters the pipe with Tin = 25oC and V = 0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe so that the fluid exits at Texit = 75oC. Taking the average fluid properties to be: ρ =...
A wall is made from an inhomogeneous (nonuniform) material for which the thermal conductivity varies through the thickness according k=ax+b, where a and b areconstants. The heat flux is known to be constant. Determine expressions for the temperature gradient and the temperature distribution when the surface at x=0 is attemperature T1.
Heat Transfer Course
5.9 In a counterflow concentric-pipe apparatus a liquid is cooled from 250 to 150 ºF by heating another from 125 to 150 ºF. The value of U1 at the cold terminal is 52 and at the hot terminal U2 is 58. At what liquid temperatures should U for the overall transfer be computed?