(B) A vertical cylinder 1.5m height and 18 cm in diameter is maintained at 100°C in an atmosphere environment of 20˚C. Calculate the heat loss by free convection from the surface of the cylinder. Use the following data: p=1.06 kg/m³ v=18.97x106 m²/s, k-0.1042 W/mK and Pr=0.6975 Nu =0.1 (Ra)¹/3
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- A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.Two vertical plates, each 200 mm high and at 90°C are placed in a tank of water at 30 °C. Calculate the minimum spacing which will prevent interference of the free convection thermal boundary layers. (k-0.674 W/mK, kinematic viscosity 0.556x 10 m/s, Pr-3.54). If the plates orientation is changed to horizontal what will be the minimum spacing which will prevent interference of the free convection thermal boundary layers(B) A vertical cylinder 1.5m height and 18 cm in diameter is maintained at 100°C in an atmosphere environment of 20°C. Calculate the heat loss by free convection from the surface of the cylinder. Use the following data: p=1.06 kg/m v =18.97×10“ m²/s, k=0.1042 W/mK and Pr=0.6975 Nu =0.1 (Ra)'3
- A vertical cylinder 1.5m height and 18 cm in diameter is maintained at 100° C in an atmosphere environment of 20˚ C. Calculate the heat loss by free convection from the surface of the cylinder. Use the following data: p=1.06 kg/m³ v= 18.97x106 m²/s, k-0.1042 W/mK and Pr=0.6975 Nu =0.1 (Ra)¹/3300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe has internal diameter (ID) of 40 cm, and outer diameter (OD) of 42 cm. The pipe is placed in another ss. pipe with ID and OD 44 cm and 44.2 cm, respectively. The gap between the pipes is filled with steel air (use air properties at 160°C from appendix). The convection heat transfer coefficient at the inner and the outer surfaces of the pipe is hi = 40 W/m². K and h2= 15 W/m². K. Determine the rate of heat loss if the length of the pipe %3D is 10 m. Also determine the temperature at inside, intermediate and outer surfaces.Natural Convection: Calculate the heat transfer rate (W) of a 4 m high and 10 m wide large vertical plate which is maintained at 65°C and exposed to atmospheric air at 21°C, with the given properties below: k = 0.0275 W/m-K (thermal conductivity) Pr= 0.7 (Prandtl Number) Vair = 17.2x10-6 m²/s (kinematic viscosity) Vertical plate It L Round off your answer to three (3) decimal places.
- 300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe has internal diameter (ID) of 40 cm, and outer diameter (OD) of 42 cm. The pipe is placed in another ss. pipe with ID and OD 44 cm and 44.2 cm, respectively. The gap between the pipes is filled with steel air (use air properties at 160°C from appendix). The convection heat transfer coefficient at the inner and the outer surfaces of the pipe is hi = 40 W/m?. K and h2= 15 W/m2. K. Determine the rate of heat loss if the length of the pipe %3D is 10 m. Also determine the temperature at inside, intermediate and outer surfaces.Natural Convection Cooling of an Orange.An orange 102 mm in diameter having a surface temperature of 21.1°C is placed on an open shelf in a refrigerator held at4.4°C. Calculate the heat loss by natural convection, neglecting radiation. As an approximation, the simplified equation for vertical planes can be used withLreplaced by the radius of the sphere (M1). For a more accurate correlation, see (S2).An electrical horizontal wire is having diameter (2 cm) and unit length. The wire is placed in room air at 10°C with heat loss (105 W) by free convection. Estimate the surface temperature for Ra=3.08 ×10. Take k = 0.02685 W/m.K Geometry Grf Prf C m Reference(s) Horizontal cylinders 0-10-5 0.4 0 Use Fig. 7-6 Use Fig. 7-6 0.53 4 0.13 0.675 0.058 1.02 0.148 0.850 0.188 0.480 1 0.125 10-5-104 104-109 10⁹-1012 10-10-10-2 10-2-10² 10²-104 104-107 107-1012 1413 1 44 4 76t 76t 76 76 76
- A 30-m-long hot rod (Diameter = 100-mm) is placed inside a room whose walls and air are at 25 C. The surface temperature of the rod is 150 C. h=10 W/m K. The surface emissivity is: your student number/10. What is the rate of heat loss from the rod? student number =201810372 %3DA vertical cylinder 1.5m high and 180 mm in diameter is maintained at 100C in an atmosphere environment of 20C.calculate heat loss by free convection from the surface of the cylinder for air take p=1.06 kg/ m2.v=18.97*10 -6 m2/s.Cp=1.004kJ/kg2C and k=0.1042kJ/ mh2CWhat is the rate of heat loss from a heated horizontal pipe as a result of natural (free) convection that have a length of 1 m and surface temperature of 100 deg C. the ambient air is at 0 deg C and the diameter of the pipe is 0.152 m. Film temperature( Tf): averaged boundary layer temperature Tf=50 C. kf=0.03 W/m.K, Pr=0.7, v=2*10-5 m2/s, B=0.0031(1/K) Select one: O a. 320.0805 O b. 285.978 O C. 435.6743 O d. 315.2324