The upper surface of a large horizontal plate 4 m high is maintained at 55°C and exposed to atmospheric air at 15°C. Calculate the heat transfer (kW) if the plate is 10 m wide. thermal conductivity = 0.02685 W/m-K kinematic viscosity = 16.5 x 10^-6 (m^2/s) Pr = 07
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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.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?Engine Oil at 58.95 degrees celsius Flows over a 5m long flat plate whose temperature is 20.11 degrees celsius with a velocity of 2.2m/s. Determine the rate of heat transfer (W), considering forced convection, per unit width of the entire plate. Density = 876kg/m^3 Thermal conductivity = 0.144W/m-K Pr = 2870 dynamic viscosity = 0.21kg/m-s Q = ?
- 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 0.17 m and the thermophysical properties of water may be approximated as: k = 0.620 W/mk, Pr = 5.2, v = 0.96x10-6 m²/5 water V m/s 20°C _q" W/m? dissipated energy from the components Water flow velocity is 2 m/s and the amount of dissipated energy (q") from the components can be estimated as uniformly distributed heat flux of 75000 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 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? 25 | 30 | 35|| 41| | 46 50 58 24 26 28 3032 36 39What is the rate of heat loss through a 4-cm Fiberglass wall of the inside temperature is 22 °C and the outside temperature is 45 °C and windy (17 kph) ? the area of the wall is 100 square meters. Include surface films. Assume the k-value for 4-cm fiberglass is 0.056 W/m. °C and the surface air film coefficient for windy velocity (17 kph) is 0.053 for out film and the inner film Rs value is 0.093 as per the surface film coefficient tables ?There is an equipment that allows to measure the heat transfer in fins with at least three different geometric shapes. To develop analysis skills among the students, the Heat Transfer teacher asks them to compare the performance of different cylindrical fins. These are "pin fins" made of aluminum (? = 200 W/m°C) and must be analyzed in terms of their relative performance as a function of diameter. Turning on the equipment, a base temperature of 200°C is recorded, the air temperature in the laboratory is T_∞= 20°C and h = 40 W/m"°C. (a) obtain an expression or mathematical model that allows calculating heat transfer as a function of the diameter of each fin.(b) Five fins with diameters of 2, 5, 10, 15, and 20 mm are available with a length of 10 cm for all, and only heat transfer is considered. heat by convection which of them have a greater heat transfer? heat flux with the diameter of the pin? (d) what would be the main factor to consider during future analysis if the fins appear…
- You are designing a small heatsink to cool a high-powered IC on a control unit PCB. The IC puts out 40,000 W/m2 and has a size of 40mm x 20mm. A fan blows 40 degrees C air across the IC at a speed of 4 m/s. The IC is well insulated on its back face. If the convection coefficient is 62 W/m2K, what is the surface temperature of the IC?ricant An oil is acting as a lubricant for a pair of cylindrical surfaces such as those shown in 1. The angular velocity of the outer cylinder is 7908 rpmt. The outer cylinder has a radius of 5.06 cm, and the clearance between the cylinders is 0.027 cm. What is the maxi- mum temperature in the oil if both wall temperatures are known to be 158° F? The physical properties of the oil are viscosity density thermal conductivity 92.3 cp 1.22 g cm-3 0.0055 cal sec-1 cm-1 ° C-1An average man has abody surface area of 1.8m2 and a skin temperature of 33degrees celcius .The convection heat transfer coefficient for a clothed person walking in still air is expressed as {h,8.6V^0.53}FOR 0.5<v<2m/s,where V is the walking velocityin m/s.Assuming the average surface temperature of the clothed person to be 30degrees celcius, determine the rate of heat loss from an average man walking in still air at 10degrees celcius by convectionat a walking velocity of (a)0.5m/s (b)1.0m/s (c)1.5m/s (d)2.0m/s
- 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?The rectangular wall of a furnace consists of 3in. fire clay brick surrounded by 0.25in. of steel on the outside. There are six 0.25in.diameter mild steel bolts per square foot connecting the steel and the brick. The furnace is surrounded by 70°F air (with a film coefficient of 1.65 Btu/hr-ft²-°F), while the inner surface of the brick is maintained at a constant 1000°F. Determine the heat flux per square foot through this wall?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?