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- A very long rod extends horizontally from a heated wall. The rod is 20 mm in diameter and the heated wall is maintained at 100 oC. The surface of the rod is exposed to an air temperature at 20 oC with convective heat transfer coefficient of 8.5 W/m2.oC. Estimate the heat loss if the thermal conductivity of copper is 400 W/m degree. Show the calculationsa) 10.71 W b) 20.71 W c) 30.71 W d) 40.71 WWhich two of the following are best correct statements for the wall with the temperature distribution shown below: A) The heat flux would be constant at any location in the wall B) It is unclear if heat is being generated within the wall C) Heat does not flow across the centerline D) Everywhere inside the wall, heat flows only to the right( same direction as the x-direction E) If the convection outside the wall is occuring with a normal magnitude of h, then it can be expected that Ts >> Tinfinity1 ohmic resistor can convert all of the 50 W of electricity into heat. Can the same amount of heat be converted into electricity by this resistor and why? a)None of the above b)No, Second law of thermodynamics dictates the directionality of the processes and prevents it to happen in the opposite direction c)No, from the caloric theory standpoint, it is not possible. d)Yes, First law of thermodynamics dictates that heat and work are the same and they can give the same change in the state of a system. e)Yes, Second law of thermodynamics recognizes that both processes are possible and therefore, no problem.
- The rate of conduction through a cobalt rod 15 mm in diameter and 270 cm long is 1.35 Watts. The cold end of the rod is 35oC. Calculate thea) mean thermal conductivity of the rod, and;b) Temperature in the hot end.• M 4 P 1::"E d) none of the mentioned أخری: When a body A is in thermal equilibrium with a body B, and also separately with a body C, then B and C will be in thermal .equilibrium with each other True False أخرى The magnitude of mechanical work is the a) product of the force and distance travelled perpendicular to the force b) product of the force and distance travelled parallel to the force c) sum of the force and distance travelled perpendicular to the force d) sum of the force and distance travelled parallel to the force أخری Work done by a system is taken to be IIHello Sir,Good Evening. I have a question in my homework related Heat Transfer lesson. The following below is my question. Please Advice. Thank You "Briefly explain, the steps we need to calculate the internal flow heat flux under the following conditions:a) Laminar flowb) Internal flow in the pipec) Long piped) Constant surface temperaturee) The outlet temperature of the fluid is unknown"
- 2. The temperature distribution associated with radial conduction through a cylindrical wall is ...... a) logarithmic behave, b) linear behave c) None of theses 3. The critical insulation radius in radial conduction is..... a) rc=h/k, b) Ter= k/h c) None of these 4. The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m. K. The measured temperature difference across a 20- mm-thick sheet of the material is T₁ T₂ = 10°C. The heat flux and heat rate through a 2 m x 2 m sheet of the insulation is - KA a) 10.5 W/m² and 68 W c) 16.5 W/m² and 48 W b) 13.5 W/m² and 29 W d) 14.5 W/m² and 58 W 5. For one-dimensional, steady-state conduction in a plane wall with no heat generation and constant thermal conductivity, the temperature a. varies exponential with x axis, b) varies linearly with x-axis, c) varies randomly with x-axis 6. Radiation heat transfer needs a media to occur where as conduction and convection is not. a) Yes, b) NoIt is a type of thermodynamic system which are able to exchange energy (heat and work) and mass across the system boundary. A.) isolated system B.) Open system C.) close system D.) all of the aboveA 15-mm radius pipe is going to be insulated with an insulation material (k=0.1 W/mK). The heat transfer coefficient between the pipe and the surrounding air is 10 W/m2K. What happens to heat transfer rate with respect to no-insulation (bare pipe) case if the thickness of the insulation material is I) 3 mm II) 4 mm III) 6 mm? a. I: decreases, II: does not change, III: increases b. I: decreases, II: decreases, III: decreases c. I: increases, II: does not change, III: decreases d. I: increases, II: increases, III: increases e. I: does not change, II: does not change, III: does not change
- Please answer legibly. Heat and Mass Transfer - Heat Exchanger Water at 95°F is heated with steam up to a temperature of 212°F. The mass of water is 110 lb and the heating times takes 1200s. a) Find the heat transfer rate of the process. Assuming 1-1 heat exchanger. b) Calculate the total area from a) given overall heat transfer coefficient is 14 BTU/hr·ft2·°F c) From b), how many tubes of 2.5 in diameter and 12ft length should be used?The outer surface of a long cylinder is kept at a constant temperature. There is no heat generation inside the cylinder. Accordingly, which of the following is correct. a)Temperature inside the cylinder increases linearly with the radius b) The temperature inside the cylinder decreases linearly with the radius c) Temperature inside the cylinder is independent of the radius d) Temperature inside the cylinder changes logarithmically with the radius e) noneIn steady state condition, the lateral surfaces of the plate are insulated, and the bottom surface is heated with a uniform heat flux. The thermal conductivity coefficient of the plate is k, and its upper surface is cooled by convection. a) Find the temperature distribution inside the plate. b) Find the temperatures at x = 0 and x = L. c) Find the amount of heat transfer transferred. NOTE: Assume one-dimensional heat conduction. h = 27 W/m2°C q" =624000W/m² k=15 W/m.°C T = 22°C L=256 cm