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- Air at 100 Fahrenheit and 2 atm is being passed over a shallow bed of naphthalene spheres that are 0.5 inch in diameter at a superficial velocity (v0) of 5 fts^-1. The MW of naphthalene is 128.2 g mol^-1, and it’s diffusivity in air at these operating conditions is 0.033 cm^2s^-1. The porosity of the bed is 0.40, and the total surface area of the naphthalene particles is 86.3 ft^2 for each 1 ft^3 of packed bed.The viscosity of air under these conditions is 0.0184 cP and the density of air is 0.0023 g cm^-3. The equilibrium concentration of naphthalene in the air under these conditions is 0.006 mol L^-1. Assuming the concentration of the naphthalene in the air stream is negligible, estimate the initial evaporation rate of the naphthalene in pounds per second from 1 ft^3 of bed.9. What is diffusion and convection? Provide an example for each!in convection heat transfer, what happen to the heat transfer coefficient if the viscosity of the fluid decrease?
- ngine oil enters the 5 mm diameter pipe at 120°C. and the Re number is about 1000. Calculate the heat lost by the fluid for a 30 cm long pipe? Engine oil You can get its specs at 390K.1) What will be the result when the pipe surface temperature is at 40°C?2) What will be the result when the pipe surface temperature is at 50°C?3) What will be the result when the pipe surface temperature is at 60°CHot water is being transported in a horizontal pipe (k = 0.15 W/m∙K, Di = 2.5 cm, Do = 4.5 cm), where the pipe inner surface temperature is at 100°C. A length of 2 m of the pipe outer surface is exposed to cool air at 12°C. Assuming that the properties of air can be evaluated at 40°C and 1 atm pressure, determine the outer surface temperature of the pipe. Is 40°C an appropriate film temperature for evaluation of the air properties?Determine the total heat content of an outdoor air sample if the samples dry bulb temperature is 93 degrees and the wet bulb temperature is 74 degrees.
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- What are the three modes of heat transfer? Describe each briefly.Hi, can you help me to answer this question using the first law of thermodynamics formula to explain this event? 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.The dimension of diffusion coefficient is ?? Explain.