A water pipe is buried 0.37 m (cf. Problem 4.12) below ground in wet soil (a = 7.75 x 10-7 m²/s and k = 2.59 W/m K). The soil is initially at a uniform temperature of 5°C. For sudden application of a convective surface condition of wind with h = 57 W/m² K and T₂ = -21 °C, will the pipe be exposed to freezing temperature (0 °C) in a 10 hour period?
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- t = 30 + 0.9563 (62.2- 30) = 60.79°C (Ans.) Example 4.14. A very thin glass walled 3 mm diameter mercury thermometer is placed in a stream of air, where heat transfer coefficient is 55 W/m2°C, for measuring the unsteady temperature of air. Consider cylindrical thermometer bulb to consist of mercury only for which k and a = 0.0166 m2/h. Calculate the time required for the temperature change to reach half its final or, %3D 8.8 W/m C %3D value.Example 7. The temperature distribution within the thermal boundary layer over a flat plate is as T ( y) = ay² + be~. Here, a and b are constant and y is normal distance measured from the plate. If liquid flowing oover the plate has temperature 25°C and K= 0.1W/m-K, then calculate the value of b. Given, hocal =2.0 W/m2-K, T = 85°C S/A stainless steel plate has a 0.03 m thickness and is initially uniform in temperature at 500 • C. The plate is suddenly exposed to a convection environment on both sides at 40 • C with h=150W/m2 o C. Calculate the times for the center and face temperatures to reach 120 • C. k=16.3 w(m.°c) ,œ= 0.44 x 10^(-5 ) m^/s *
- A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 2.66 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.What is the convection heat transfer rate (W)? Air properties (k = 0.02439 W/m,C, Pr = 0.7336, v = 1.426E-5 m/s) %D Select one: A. 637.1 B. 1129.1 C. 142.31 D. 891.5 E. 367.6A car's rear window is defogged by the passage of hot air over its inner surface. If the hot air is at T∞, i = 40 °C and the corresponding convection heat transfer coefficient is hi = 30 W/(m²K), what are the temperatures of the inner and outer surfaces of the glass, which has 4 mm thick, if the outdoor ambient air temperature for T∞, e = −10 °C and the associated convective coefficient for he = 65 W/(m²K)?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?
- A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.85 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.Wliat is the convection beat transfer rate (W)? Air properties (k= 0.02439 W/m."C, Pr=0.7336, v 1.426E-5 m /s) %3D Select one O A 1434.3 OB 1688.6 OC 1926.3 OD. 939.46 OE 1164.8A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at %3D 0°C.What is the convection heat transfer rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s ) %3D Select one: A. 1911.1 В. 1419.1 C. 1673.5 D. 1149.6 E. 924.31Q3/ A copper sphere having a diameter of 3.0 cm is initially at a uniform temperature of 50°C. It is suddenly exposed to an airstream of 10°C with h=15 W/m?. C. How long does it take the sphere temperature to drop to 25°C? (p=8900 kg/m', k=380 W/m'C, and C=0.38 kJ/kg."C) Good Luck
- A horizontal thin plate with a length of L= 10 cm is tiled with a constant heat flux from the bottom and is cooled by air at the top. The air velocity is U = 40 m / s and the temperature is 20 ° C. What should be the minimum heat flux so that the plate temperature does not exceed 80°C? (kW / m²) v 17.94 x 10-6 m²/s = 0.0277 W/(m.K) Pr = 0.71Electronic 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 39Required information Water at 20°C is flowing with velocity of 0.89 m/s between two parallel flat plates placed 1 cm apart. Given: The ploperties of water at 20°C are p= 998.0 kg/m3, µ = 1.002 × 103 kg/m-s and Pr = 7.01 Determine/the distances from the entrance at which the thermal boundary layers meet. (Round the final answer to one decimal place.) The distance from the entrance at which the velocity boundary layers meet is m.