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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 control volume steady flow system has multiple inputs and outputs with heat and work transfer across boundary. Write out the equation for the first-law relation of the system and identify each term.
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.