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Hydrogen at a pressure of 2 atm flows within a tube of diameter 40 mm and wall thickness 0.5 mm. The outer surface is exposed to a gas stream for which the hydrogen partial pressure is 0.1 atm. The mass diffusivity and solubility of hydrogen in the tube material arc
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Chapter 14 Solutions
Fundamentals of Heat and Mass Transfer
- Thermal fluid mechanics Detailed solution With an understanding of the laws of the subjectarrow_forwardA certain gas was produced as a product of a decomposition reaction in a reactor vessel. The reaction generated a certain amount of force that allowed the gas to move at 35 m/s. The diatomic product gas (gamma = 1.36) will be transported adiabatically in a commercial steel pipe with a diameter of 1 inch. If the exit of the reactor and start of the pipe has a same pressure of 6 atm abs. and temperature of 120 degrees Celsius. The molecular weight of the gas is 70.91 kg/kgmol. 2. What is the Mach No. at the entry of the pipe? 0.36 0.41 0.14 none of the given 0.25 0.52 0.63arrow_forwardi need the answer quicklyarrow_forward
- All properties should be evaluated at the temperature of the steam.Saturated, pure steam at 65 ºC condenses on the surface of a vertical tube with outersurface diameter 2 cm which is maintained at a uniform temperature of 35 ºC. Determinethe tube length for a condensate flow rate of 5 x 10-3 kg/s.arrow_forwardFrom 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)arrow_forwardDetermine the heat absorbed, when 1 mol of carbon monoxide gas is heated from 212.4 K to 437.2 K. The relationship for the heat capacity at constant pressure in J mol-1 K-1 is Cp = a + bT + cT2, with a = 25, b = 7.0 x 10^-3, and c = -8 x 10^-7arrow_forward
- At a certain location during the winter, the average air temperature is 10 degrees Celsius and the net radiation is 40 W/m^2 and during the summer the net radiation is 200 W/m^2 and the temperature is 25 degrees Celsius. Compute the evaporation rates using the PRiestley-Taylor Methodarrow_forwardIn boiling water at 1 atm pressure outside a stainless-steel tube with a surface temperature of 410F, the heat-transfer coefficient h in the absence of radiation is 32 Btu/h*ft^2*F. If the emissivity of the stainless steel is 0.8, will radiation significantly augment the rate of boiling (e.g., by more than 5 percent)? Assume that the vapor film is transparent to radiation and the boiling liquid is opaque.arrow_forwardWater at atmospheric pressure is boiled in a container using a horizontal 8 mm electric wire (ε=0.9) whose temperature is maintained by an electric current at 250oC. Estimate the boiling heat transfer coefficient between the water and the wire surface. Properties of Water, liquid: ρl = 957.9 kg/m3, hfg = 2257 kJ/kg, vapor: ρv = 4.8 kg/m3, Cp,v = 2560 J/kg.K, μv = 14.85*10-6 N.s/m2, kv=0.0331 W/mK. Select one: a. 247 W/m2K b. 440 W/m2K c. 90.7 W/m2K d. 710 W/m2Karrow_forward
- An air stream containing water vapor flows over a cold container and water condenses at the bottom as shown. The mole fractions of air and water vapor are shown by the lines, with the mole fraction scale at the bottom of the figure. The figure that most correctly represents the variation of the mole fractions of air and water vapor with height is O 0 Water vapor 0 Water vapor 0 mole fraction Water Water Air Water mole fraction 1 Water mole fraction Water 1 Air mole fraction Airarrow_forwardAir at 25°C and atmospheric pressure flows with a velocity of 3 m/s inside a 10mm diameter tube of 1 m length. The inside surface of the tube contains a deposit of naphthalene. Determine the average mass transfer coefficient for the transfer of naphthalene from the pipe surface into the air.arrow_forwardAH of vaporization of water is 439.2 cal/g at the normal boing point. Since virus can survive at 404.39 K by forming spores. Most virus spores die at 851.9 K. Hence, autoclaves used to sterilize medical and laboratory instruments are pressurized to raise the boiling point of water to 851.9 K. Find out at what InP (torr) does water boil at 851.9 K? O a. 8460.435 O b. 940.048 c. 1880.097 O d. 2.474arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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