12. The temperature at the inner and outer surfaces of a hollow cylindrical pipe with wall...
12. A liquid flows in a slit in the z-direction down a vertical plane, between 2 broad parallel plates with distance L under the influence of gravity,g, with the plane parallel to the axis of gravity. Assume a uniform thickness of 2D for the liquid layer in the x-direction, steady state laminar flow, and that the fluid is Newtonian and incompressible. The plate at x=0 is heated to a constant temperature of Tp and all the fluid enters the slit...
A stainless pipe having an inner wall thickness of 5 cm, an outer wall thickness of 5.5 cm and a thermal conductivity of 15 W/m˚C transfers steam at 320˚C from one location to another. The pipe is insulated with a 3 cm thick glass wool having a thermal conductivity of 0.038 W/m˚C. Heat is lost to the surroundings by natural convection and radiation at a rate of 15 W/m2˚C and the heat transfer coefficient inside the pipe is 80 W/m2˚C....
1) The temperature at the inner and outer surfaces of a boiler wall made of 20 mm thick steel and covered with an insulating material of 5 mm thickness are 3000 C and 500 C respectively. If the thermal conductivities of steel and insulating material are 58W/moC and 0.116 W/moC respectively, determine the rate of flow through the boiler wall.
Use the integral method for boundary layer flow and convective heat transfer over a flat plate heated by maintaining a constant heat flux q"w, for the case of very low Prandtl number, Pr0. Assume that the free stream velocity of the fluid, U, and free stream temperature, T-do not vary with x. Using the integral form of energy equation, show that under these conditions: (a) the temperature profile, (T- T) is given by, 41 2 CT-T oa (b) the wall...
Assist The inner and outer surfaces of a 6-mx7-m brick wall of thickness 40 cm and thermal conductivity 0.55 W/m°C are maintained at temperatures of 26°C and T°C, respectively Determine the rate of heat transfer through the wall, in W. Chec Print Questi Report Brick wall 28 C
2072 A hollow cylindrical conductor of length L (like the insulation around a pipe) has inside radius a and outside radius b. The inside surface temperature is T, and the outside surface temperature is T T, and T, remain fixed. Unlikely as it seems, the conductivity of the insulating material is not constant but increases as the square of the radius, according to K(r) K,r , where K, is a constant. Find the heat flow rate ( in cal/sec), in...
3.68 Consider o conduction in a plane com- posite wall. The outer surfaces are exposed to a fluid at 25°C and a convection heat transfer coefficient of 1000 Wim K. The generation q8, while there is no generation in walls A and C. The temperatures at 261°C and T2-211 C. middle wall B experiences uniform heat the interfaces are T, T. 9a k,-25 W/rm-K LA = 30 mm c-50 W/m-K L 30 mm L 20 mnm (a) Assuming negligible contact...
Problem 3 (30 Points) Consider a specific application where a synthetic engine oil is used as a working fluid in a journal bearing with a gap between the top & bottom surfaces of L=0.6 mm. Here, the top surface moves to the left with a constant velocity (Vr) of 16 m/s, while at the same time the bottom surface moves to the right with a constant velocity (Vb) of 9 m/s. The top surface is isothermal as it is maintained...
The figure below shows a hollow sphere made of a material with a temperature-dependent conductivity. The conductivity of the material is given by: k=bT where b = 0.01 W/m-K and T is the temperature in K. TH Tc Tout The sphere is used to contain liquid neon; therefore, the inner surface of the sphere at rin = 2 cm is held at Tc = 30 K. The outer surface of the sphere is exposed to ambient temperature; therefore, the temperature...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...