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- An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a resistance of 310-4 ohm per meter of length. If the air around this line is at v, determine the surface temperature on a windy day, assuming a wind blows across the line at 33 km/h.Determine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.Thermodynamics problem. A membrane type electrical heater of 20,000 w/m? capacity is sandwiched between an Insulation of 25 mm thickness with thermal conductivity of 0.029 W/m-K and a metal plate with k = 12.6 W/m-K of thickness 15 mm. The convection coefficient is 150 W/m2-K. The surroundings are at 5°C. Determine the surface temperature of the heater and the flow on either side.
- A hot plate 1.2 m wide, 0.35 m high and at 115 0C is exposed to the ambient still air at25 0C. Calculate the following: (i). Average heat transfer coefficient over the surface ofthe plate; (ii) Heat loss from the plate; (iii) Rise in temperature of the air passing throughthe boundary. Properties of air at 70 C temperature are: r = 1.029 Kg/m3; Cp = 1005 J/KgK; K = 0.0267 W/m K; m = 1.866 * 10'5 N- S/mz; Ans: Gr = 27.532*107 (i) h = 5.43 W/m2C; (ii) Q = 410.5W (iii) At = 85.45 CDetermine the thermal boundary thickness(mm) of flow over a flat plate which has a 0.5 mm boundary layer thickness. Take u= 25 x 10 Pas, C,=2.0 kJ/kg K and k=0.05 W/m K.You've experienced convection cooling if you've ever extended your hand out the window of a moving vehicle or into a flowing water stream. With the surface of your hand at a temperature of 30°C, consider the two following conditions. Condition A: a vehicle speed of 35 km/h in air at -9°C with a convection coefficient of 40 W/m2-K. Condition B: a velocity of 0.2 m/s in a water stream at 10°C with a convection coefficient of 900 W/m2-K. What is the convection heat flux for the following? Condition A: i W/m? Condition B: qwater i W/m2 %3D
- Electronic components are attached under a thin square plate and the all the energy dissipated by components is removed by water flow over the top surface. The plate length is 0.18 m and the thermophysical properties of water may be approximated as: k = 0.620 W/mK, Pr = 5.2, ν = 0.96x10-6 m2/s Water flow velocity is 1.5 m/s and the amount of dissipated energy (q’’) from the components can be estimated as uniformly distributed heat flux of 80000 W/m2. One approach to analyze this problem is to assume the plate has an isothermal temperature as a boundary condition. Calculate the average isothermal plate temperature in °C for the given conditions blank If the boundary layer is ‘tripped’ and the flow over the plate is completely turbulent; what will be the average isothermal plate temperature in °C for this case?Calculate the ratio of thermal-boundary-layer thickness to hydrodynamic-boundary- layer thickness for the following fluids: air at 1 atm and 20°C, water at 20°C, helium at 1 atm and 20°C, liquid ammonia at 20°C, glycerine at 20°C.You've experienced convection cooling if you've ever extended your hand out the window of a moving vehicle or into a flowing water stream. With the surface of your hand at a temperature of 30°C, consider the two following conditions. Condition A: a vehicle speed of 35 km/h in air at -5°C with a convection coefficient of 40 W/m2-K. Condition B: a velocity of 0.2 m/s in a water stream at 10°C with a convection coefficient of 700 W/m²-K. What is the convection heat flux for the following? Condition A: i W/m? air Condition B: qwater W/m? i
- Need answer ASAP! Thank you Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. Thewater flow over the surface of the apple creates a convective heat-transfer coefficientof 10 W/(m2-K). Assume the apple can be described as a sphere with an 8 cm diameterand the geometric center is to be reduced to 10°C. The apple properties include thermalconductivity of 0.4 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3 a. Determine the time that the apples must be exposed to the water.b. If the apple is submerged only for 2 hours, what will be its center temperature?Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. Thewater flow over the surface of the apple creates a convective heat-transfer coefficientof 15 W/(m2-K). Assume the apple can be described as a sphere with a 10 cm diameterand the geometric center is to be reduced to 10°C. The apple properties include thermalconductivity of 0.45 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3.a. Determine the time that the apples must be exposed to the water.b. If the apple is submerged only for 2 hours, what will be its center temperature?ASAP