40: A circular ball, 1 in. in range and at a temperature of 800°F, is nowhere extinguished in an enormous pool of fluid which is kept up at 280°F. Gauge the surface temperature of the ball following 60 mir The normal convective warmth move coefficient h = 2 Btu/hr ft2°F properties of the ball material are: k = 25 Btu/hr ft°F p 492 lbm/ft3 %3D
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Q: 40: A circular ball, 1 in. in range and at a temperature of 800°F, is out of nowhere extinguished in…
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- 7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?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.Q.1) Determine the convection heat transfer coefficient and the heat flux on the plate surface for flow of air at T = 20° C over a plate surface maintained at a constant temperature of T₁ = 160° C. if the dimensionless temperature profile within the air layer = e-ay, where a = 3200 m ¹ and y is the vertical over the plate is determined to be T(y)-Too Ts-Too distance measured from the plate surface in m.
- Q.1) Determine the convection heat transfer coefficient and the heat flux on the plate surface for flow of air at T = 20° C over a plate surface maintained at a constant temperature of T, = 160° C. if the dimensionless temperature profile within the air layer T(y)-Too = e-ay where a = 3200 m¹ and y is the vertical T₁-Ta over the plate is determined to be distance measured from the plate surface in m.3. Consider two large isothermal plates separated by 2-mm thick oil film. The upper plate moves as a constant velocity of 12 m/s, while the lower plate is stationary. Both plates are maintained at 24 °C. a. Obtain relations for the velocity and temperature distribution in the oil b. Determine the maximum temperature in the oil and the heat flux from the oil to each plate. Properties: k= 0.145 W/mK µ= 0.8374 kg/ms =0,8374 Ns/m?Provide the answers with clear explantion and images. Coolant flowing through a radiator at the rate of 3 kg/s are cooled from 105 0C to 81 0 The specific heat capacity of coolant and air are 4.19 kJ/kg K and 1.13 kJ/kJ/K respectively. Th overall heat transfer coefficient from gas to water is 140 W/m2 K. Calculate the surface area required for the radiation if the vehicle speed is 100 km/h. Consider the density of air as 1.225 kg/m3.
- Convection 2. For a boiling process such as shown in Figure below, the ambient temperature Tin Newton's law of cooling is replaced by the saturation temperature of the fluid Tsat. Consider a situation where the heat flux from the hot plate is q=20 x 105 W/m². If the fluid is water at atmospheric pressure and the convection heat transfer coefficient is hw=20 x 103 W/m2 K, determine the upper surface temperature of the plate, Ts, w. In an effort to minimize the surface temperature, a technician proposes replacing the water with a dielectric fluid whose saturation temperature is Teat, d=52 °C. If the heat transfer coefficient associated with the dielectric fluid is h = 3 x 103 W/m2 K, will the technician's plan work?A computer circuit board dissipates 0.1 KW from one side over an area 300 mm by 200 mm. A small turbo fan cools the computer with flow speed of 12 m / s. It is of utmost importance that the circuit board is kept within acceptable temperature range. Using the average Nusselt number relationship Nuav = (0.05Rez08 – 310) Pr3. You are required to calculate: (i) The surface temperature of the board for an air temperature of 30 °c. Assume: Ambient pressure of 1 bar, R = 287 J/ kg K, Cp = 1 kJ / kg K, k = 0.03 W / m K, and u = 2 x 10% kg/m s(1) Determine the convection heat transfer coefficient and the heat flux on the plate surface for flow of air at T = 20° C over a plate surface maintained at a constant temperature of T, = 160° C. if the dimensionless temperature profile within the air layer over the plate is determined to be e-ay where a = 3200 m¹ and y is the vertical distance measured from the plate surface in m. =
- Palm oil with a density of 1200 kg/m3 and the specific heat of 2 kJ/(kg.K) is to be heated from 20oC to 80oC before further processing. The oilplaced in a vessel (vessel) cylindrical upright with a diameter of 2 meters.The height of the oil vessel inside is 2 meters. For this purpose, an electric heating element with an electrical resistance type of heat is used.The electrical resistance used is a 2 mm diameter conductor wire wrappedwith magnesium oxide material with a thermal conductivity of 0.4 W/(m.K) thick 2.5 mm, then coated with the outermost metal 0.5 mm thick. Occurring power density on the outermost metal layer should not be more than 25 kW/m2. Warm-up time is expected to be only about 1.5 hours. Calculate: a) Required electrical power? (in kW) b) Rating of the heater by meter length? c) Maximum temperature of the heater element?Relationship between fluid flow and convection heat transferA cyclic process consists of two isothermal and two isobaric processes. Calculate the network done on the sytem in this cyclic process.