Sir while seeing plane wall with generation u said that "when we have heat generation we can't use resistance model concept " And then in example sum u used the resistance concept to find T1? while we have heat generation at slab A how we can use resistance concept sir
Please sent to me as PDF formHydrogen at 15 ºC and a pressure of 1 atm. is flowing along a flat plate at a velocity of 3 m/s. If the plate is 0.3 m wide and at 71 ºC, calculate the following quantities at x = 0.3 m and at the distance corresponding to the transition point, i.e., Rex = 5 x 105 (take properties at 43ºC) (a) Hydrodynamic boundary layer thickness, in cm, (b) Local friction coefficient, (c) Average friction coefficient, (d) Drag force, in N, (e) Thickness of thermal boundary layer, in cm, (f) Local convective-heat-transfer coefficient, in W/m2-ºC, (g) Average convective-heat-transfer coefficient, in W/m2.ºC, and (h) Rate of heat transfer, in W. Consider a 15-cm x 20-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. If the circuit board is dissipating 8 W of power in steady operation, determine the average temperature of the hot surface of the board, assuming the board is (a) vertical, (b) horizontal with hot surface facing up, and (c) horizontal with hot surface facing down. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. A shell-and-tube heat exchanger with 2-shell passes and 8-tube passes is used to heat ethyl alcohol (Cp = 2670 J/kg · °C) in the tubes from 25°C to 70°C at a rate of 2.1 kg/s. The heating is to be done by water (Cp = 4190 J/kg · °C) that enters the shell side at 95°C and leaves at 45°C. If the overall heat transfer coefficient is 950 W/m2 · °C, determine the heat transfer surface area of the heat exchanger.
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Sir while seeing plane wall with generation u said that "when we have heat generation we can't use resistance model concept " And then in example sum u used the resistance concept to find T1? while we have heat generation at slab A how we can use resistance concept sir
Awesome sir
Why the centre of symmetrical heat profile consider as adiabatic sir? Practical explanation please sir!!
Please sent to me as PDF formHydrogen at 15 ºC and a pressure of 1 atm. is flowing along a flat plate at a velocity of 3 m/s. If the plate is 0.3 m wide and at 71 ºC, calculate the following quantities at x = 0.3 m and at the distance corresponding to the transition point, i.e., Rex = 5 x 105 (take properties at 43ºC) (a) Hydrodynamic boundary layer thickness, in cm, (b) Local friction coefficient, (c) Average friction coefficient, (d) Drag force, in N, (e) Thickness of thermal boundary layer, in cm, (f) Local convective-heat-transfer coefficient, in W/m2-ºC, (g) Average convective-heat-transfer coefficient, in W/m2.ºC, and (h) Rate of heat transfer, in W.
Consider a 15-cm x 20-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back surface of the board is negligible. If the circuit board is dissipating 8 W of power in steady operation, determine the average temperature of the hot surface of the board, assuming the board is (a) vertical, (b) horizontal with hot surface facing up, and (c) horizontal with hot surface facing down. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room.
A shell-and-tube heat exchanger with 2-shell passes and 8-tube passes is used to heat ethyl alcohol (Cp = 2670 J/kg · °C) in the tubes from 25°C to 70°C at a rate of 2.1 kg/s. The heating is to be done by water (Cp = 4190 J/kg · °C) that enters the shell side at 95°C and leaves at 45°C. If the overall heat transfer coefficient is 950 W/m2 · °C, determine the heat transfer surface area of the heat exchanger.
How did you calculate T1
calculate overall resistance network and put value of q.
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