Driving force for the free convection is Shear stress forces Buoyancy forces None of the above Pressure forces O Surface tension forces
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- 1. A steel sphere 3” in diameter heated to 600oF, is to be cooled by immersion in an oil bath at 100oF. Calculate the average temperature of the sphere a) 10 sec and b) 6 min after immersion. For steel, k = 26Btu/ft-h-oF; = 486lb/ft3 ; Cp = 0.11Btu/lboF.A cyclic process consists of two isothermal and two isobaric processes. Calculate the network done on the sytem in this cyclic process.1. The boiling temperature of water is 100 °C. If you put boiling water in a mugplaced at the table top, you observed that after some time the water cools down,decreasing the temperature of water in the mug. Why is this so? Explain using theZeroth Law of Thermodynamics. What happens to objects when temperature increases? For instance, a jar cover an be removed by putting the cover in hot water. Why is this so?
- Most automobiles have a coolant reservoir to catch radiator fluid that may overflow when the engine is hot. Such a radiator, made of copper, is filled to its 12-L capacity when at 10.0°C. -What volume of radiator fluid, in liters, will overflow when the radiator and fluid reach their 99.5°C operating temperature, given that the fluid’s thermal coefficient of volume expansion is 400.0 × 10-6 / °C? The coefficient of volume expansion for copper is 5.1 × 10-5 /°C.Awatermelon initially at 35°C is to be caoled by dropping itinto a lake at 15°C. After 4 h and 40 min of cooling the center temperature of watermelon is measured to be 20°C. Treating the watermelon 25 a 20-c-diameter sphere and using the properties k = 0.618 WimHeat Transfer Lesson The water will be heated from 10 (Degrees centigrade oC) to 90 (Degrees centigrade oC) while flowing through a smooth pipe with 1.5 cm inner diameter and 7 meters length.The entire surface of the pipe is equipped with an electric heater, which ensures uniform heating throughout.The outer surface of the heater is well insulated and therefore all heat generated in the heater in continuous operation is transferred to the water in the pipe.If the system provides 6 Liter / minute flow rate of hot water. (Thermophysical properties of water at 50 oC:ρ = 988 m3/kg, k= 0.6305 W/m oC, cp=4181 J/kg oC, Pr=3.628, μ= 0.0005471 kg/m.s ) a)Find the power of the resistance heater [W]. b)Calculate the inner surface temperature [oC] of the pipe at the outlet. c)Find the pressure drop [Pa]. d)Find the pump power [W] required to overcome this pressure drop.
- A transformer is to be cooled via forced air convection. To increase the effectiveness of thecooling, Alloy 1095 cast aluminum fins are attached to the top of the transformer overwhich air is blown (negligible thermal contact resistance between the transformer and thefins). The fins are 2 cm thick and 7 cm long and span the entire length of the transformer,and the transformer is 7 cm wide and 10 cm long. Air leaves the cooling fan at 25°C .a) Decide how to model the fins before performing any real analysis. Youare willing to accept some error in your analysis and so you will either model thefins as having adiabatic tips or being infinitely long. You expect the average convectioncoefficient over the heat transfer surfaces for this system to be around 50 W m2– K⁄ .Which tip condition should you use for the fins in your analysis? b) Modeling the transformer as being isothermal, determine the average convectioncoefficient over the heat transfer surfaces. Account for heat transfer from the…Hi, can you help me to answer this question using the first law of thermodynamics? On a hot summer day a student turns his fan on when he leaves his room in themorning. When he returns in the evening will the room be warmer or cooler than theneighborouing rooms ? Explain your answer using the first law of thermodynamics.Assume ALL doors and windows are kept closed.An one piece window, surface area of 14 m2 and thickness of 5.0 mm, has inner surface temperature of 10 °C, and outer surface temperature is -10 °C. Calculate the con- duction rate through the window. Use 0.80 W/(K·m) for the thermal conductivity of the glass.
- This question about heat transfer/liquid. A horizontal wire of circular cross section with a diameter of d=1 mm is heated with electric current, and 100W(q'=100W/m) heat energy is given to the wire from 1m length. The wire T∞ = temperature at 20 ° C, large, compared to that in a stagnant water body, locate the outer surface temperature of the wire.Obtain the following basic equations modeling natural convection in the two-dimensional plane at steady conditions in terms of the given dimensionless quantities. Note: The buoyancy term in the y-momentum equation will be obtained based on dimensionless numbers.A 2.5-m-tall steel cylinder has a cross-sectional area of 1.5 m2. At the bottom, with a height of 0.5 m, is liquid water, on top of which is a 1-m high layer of gasoline, relative density of 0.8. The gasoline surface is exposed to atmospheric air at 101 kPa. What is the gage pressure at the liquid interface?