Water at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that generates h by 8.5 kW/m³. The cylinder has a diameter of 0.3 m. Thermal conductivity of the cylinder is 28 W/m. Assuming the film temperature is same as the water temperature, find out the surface temperature of cylinder. Then comment whether the assumption related to film temperature was reasonable. Ts = 10'33 °C
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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.Water at 10°C is is flowing at 0.8 m/s across a long cylinder that is made of a material that generates heat by 8.5 kW/m³. The cylinder has a diameter of 0.3 m. Thermal conductivity of the cylinder is 28 W/m. °C. Assuming the film temperature is same as the water temperature, find out the surface temperature of the cylinder. Then comment whether the assumption related to film temperature was reasonable. Ts = 10'33 °℃
- Engine oil enters the 5 mm diameter pipe at 120°C. The pipe surface temperature is kept at 40°C and the Re number is about 1000. Calculate the heat lost by the fluid for a 30 cm long pipe? Engine oilYou can get its specs at 390K.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 10 cm outer diameter pipe carrying saturated steam at a temperature of 195C is lagged to 20 cm diameter with magnesia and further lagged with laminated asbestos to 25 cm diameter. The entire pipe is further protected by a layer of canvas. If the temperature under the canvas is 20°C, find the mass of steam condensed in 8 hrs on a 100m length of pipe and interface temperature. Take thermal conductivity of magnesia as 0.07 W/m – K and that of asbestos as 0.082 W/m – k. Neglect the thermal conductivity of the pipe material. The latent heat of steam for given conditions can be taken as 1951 kJ/kg–K.
- Q3/ A 10-cm length of platinum wire 0.5 mm in diameter is placed horizontally in a container of air at 35 C and is electrically heated so that the surface temperature is maintained at 93•C. Calculate the surface temperature for heat lost by the wire 30W.A pipe 30 m long with an outer diameter of 75 mm is used to carry steam at a rate of 1000 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be insulated with a thermal conductivity of 0.2 W / (m K) so that the quality of the steam will only slightly decrease to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore resistance conductive of the pipe material and it is assumed that there is no pressure drop in the pipe. a. Determine the enthalpy of incoming vapor = Answer kJ / kg. b. Determine the enthalpy of steam coming out = Answer kJ / kg. c. Determine the vapor heat change / loss along the flow = Answer watt. d. Specify the minimum required insulation thickness = Answer cm.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
- Oil is flowing through a 50 mm-ID and 55 mm-OD pure iron pipe at 1 m/s. It is being heated by steam outside the pipe and steam film coefficient may be taken as 11 kW/m2°C. At a particular point along the pipe, the oil is at 50°C, its density is 880 kg/m³, its viscosity is 2.1 cP, its thermal conductivity is 0.135 W/m°C and its specific heat is 2.17 J/g°C. What is the overall heat transfer coefficient at this point, based on the inside area of the pipe? If the steam temperature is 130°C, what is the heat flux at this point, based on the outside area of the pipe?A pipe 30 m long with an outer diameter of 75 mm is used to deliver steam at a rate of 2000 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be insulated with a thermal conductivity of 0.2 W / (m K) so that the quality of the steam will only slightly decrease to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore resistance conductive of the pipe material and it is assumed that there is no pressure drop in the pipe. a. Determine the enthalpy of incoming vapor = AnswerkJ / kg. b. Determine the enthalpy of steam coming out = AnswerkJ / kg. c. Determine the vapor heat change / loss along the flow = Answerwatt. d. Specify the minimum required insulation thickness = Answercm.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?