• Air at 40 oC and 1 atm flows over a 5 m long wet plate with an average velocity of 2 m/s to dry the surface. Using analogy between heat and mass transfer. Determine the mass transfer coefficient on the plate. • Extra information: at 40 oC and 1 atm, v= 1.702 *10-5 T2.072 ● DAB 1.87 x 10-5 x P
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- • Problem 1 • Air at 40 oC and 1 atm flows over a 5 m long wet plate with an average velocity of 2 m/s to dry the surface. Using analogy between heat and mass transfer. Determine the mass transfer coefficient on the plate. • Extra information: at 40 oC and 1 atm, v= 1.702 *10-5 T2.072 • DAB 1.87 x 10-5 X PAir at 20°C and 1 atm flows through a cylindrical tube made of naphthalene at a velocity of 5 m/s. The diameter of the tube is 0.1 m. Using the correlations, calculate the mass transfer coefficient for this setup. Then, compare this result with the mass transfer coefficient from the Reynolds Analogy, Prandtl Analogy, Von Karman Analogy, and Chilton-Colburn Analogy. The effectivity diffusivity is 4.24 x 10-6 m2/s.air is flowing inside of a pipe with radius=0.4 meters at a mass velocity of 29.4 kg/s*m2 at 322 K, with the walls of the pipe at 300 K. At the conditions of the experiment, the viscosity of air is 1.984 x 10-5 Pa*s, the density of air is 1.22 kg/m3, the heat capacity is 1 kJ/kg*K, and the thermal conductivity is 0.025 W/m*K. Determine the rate of heat loss by air per meter of duct.
- Incident radiation at the Laguna Lake is 985 W/m2 at noon on February 14th. Water temperature is 27.5 °C. Air temperature is 28.0°C, relative humidity is 75%, and wind speed is 1.7 m/s at 2m. - Determine the open water evaporation rate in mm/d using the energy methodUse the definition of the Sherwood number to calculate the mass transfer coefficient (in cm/s) for a scenario where the characteristic length is 0.034 m, the diffusivity is 0.00099 cm^2/s, and the Sherwood number is 3.5.In a falling-film evaporator, Air at 40℃ and 50 kPa flows through a wetted-wall column with 100 mm diameter at a velocity of 5 m/s. What is the mass-transfer coefficient for the humidification of this stream by evaporation from the wet walls? If the air in this situation is 50 % saturated, and the saturation particle pressure of water vapour at 40℃ is 7375 Pa, what is the local evaporation flux in a unit of kg/m²s?
- Explain what is mean by "wet steam" and show that the volume of 1 kg of wet steam is very nearly equal to the dryness fraction times the specific volume of dry saturated steam. 0.125 m of wet steam at 1 MPa has an enthalpy content of 1809 kJ/kg. Calculate the mass and dryness fraction of the steam. If a sample of this steam is throttled to 70 kPa. Calculate its final condition. Take specific heat capacity of superheated steam at constant pressure is 2 kJ/kg K. 8.Wet sawdust will be dried using air on a circular tray with a diameter of 10 cm and the variation of moisture content over time will be examined. The heat transfer coefficient was calculated as 0.64 cal/min.cm2.°C and the mass transfer coefficient as 3.86 g/cm2.min during the constant speed drying interval lasting 10 minutes. Calculate the dry bulb temperature since the absolute humidity of the air used for drying is 0.018 g water/g dry matter and the wet bulb temperature is 25°C. Additional data: Enthalpy of evaporation of water: 2442.3 kj/kg at 25°C Vapor pressure of water: 23.76 mm Hg at 25°CFrom an open water surface with air temperature 22°C, relative humidity is 40% and wind speed is 3 m/s, all measured at height 2 m above the water surface. Assume a roughness height of 0.03 cm. The net radiation is 200 W/m^2. Cp = 1005 J/kg-K A. Calculate the latent heat of vaporization (J/kg) B. Calculate the evaporation using Energy Balance Method (mm/day) C. Calculate the saturation deficit of the vapor pressure (Pa) D. Calculate the evaporation using Priestley-Taylor Method (mm/day)
- Elaborate why is heat and mass transfer important in engineering. Provide three examples of heat and mass transfer applications and elaborate the significance of HMT in their design?Determine the specific heat capacities at constant volume and constant pressure for nitrogen, given that its molecular weight is 28 and the adiabatic index for expansion and compression is 1.4. The universal gas constant is 8314 Jmol-1K-1. Explain the difference in the values for the two specific heat capacities.Humid air at constant 101 kPa pressure, 30°C temperature and 40% relative humidity undergoes an isobaric cooling process unitl its temperature reaches 22°C. Calculate how much energy by heat is transferred from the air stream in kJ per kg of dry air. Give you answer to two significant figures and enter the numerical value only (eg. 0.0123, 0.123., 123, 1230, but not 0.0123 kJ/KGDA). 3