A laboratory apparatus to measure the diffusion coefficient of vapor—gas mixtures consists of a vertical, small-diameter column containing the liquid phase that evaporates into the gas flowing over the mouth of the column. The gas flow rate is sufficient to maintain a negligible vapor concentration at the exit plane. The column is 150 mm high, and the pressure and temperature in the chamber are maintained at 0.25 atm and 320 K, respectively.
For calibration purposes, you ye been asked to calculate the expected evaporation rate
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Fundamentals of Heat and Mass Transfer
- Thermal conductivity, temperature and heat flux in a solid are, respectively, analogous to mass diffusion coefficient, concentration and mass flux. Choose an option: Real or Falsearrow_forwardA diffusion couple of two metals, A and B, was fashioned as shown: Diffusion of A atoms A-B alloy B Diffusion of B atoms After a 690 hour heat treatment at 1120°C the concentration of A is 1.8 wt% at the 3.2 mm position within Metal B. At what temperature (in Kelvin) must the diffusion couple need to be heated to produce this same concentration at a 2.3 mm position after 690 h? The preexponential and activation energy values for the diffusion of A in B are 1.9 x 104 m²/s and 239 kJ/mol, respectively.arrow_forwardFor Cairo Egypt in January the average net radiation 40 W/m2, temperature is 14°C. relative humidity is 65%, and wind speed is 2.0 m/s measured @ a height of 2.0 m. Compute the evaporation rate by 1. Priestley-Taylor Method Zo=0.03arrow_forward
- Calculate the capillary effect in mm in a glass tube of 2mm diameter, when immersed in (1)water, (2)mercury. The temperature of the liquid is 25ᵒC and the values of surface tensions of water and mercury at 25⁰C in contact with air is 0.0765 and 0.57N/m respectively. The angle of contact for water is 0ᵒ and 130ᵒ for mercury . Take the density of water 1000 kg/m3 , specific gravity of mercury is 13.6. The capillary effect of water in mm is equal to=_________ The capillary effect of mercury in mm is equal to= ___________arrow_forwarduestion 5 a. Calculate the capillary effect in millimeters in a glass tube of 4mm diameter, when immersed in (i) water (ii) mercury the temperature of the liquid is 20o in contact with air are 0.073575 N/m and 0.51 N/m respectively. The angle of contact for water is zero and that for mercury is 130o. Take density of water at 20o as equal to 998 kg/m3. CYE GREEN PLAITAIN Answeredarrow_forwardThe densiaies of two ligeids A and 1B are gileen as lo00trg/m² and 6ookg/ms respectivrely.Ih tevo liquids. are mixed ma certain propertion cend the denSity op the resulting liquid is 85olig/m3. Holo much of liquidn (in graims) does rg ef the mixture cantain! Asqume the llelum e of the two lifuids is additivee when mixed.arrow_forward
- AH 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_forwardThis question is related to heat and mass transfer subjectarrow_forwarddetermine the saturation mixing ratio and the mixing ratio of each of the following air samples. For the SMR and MR, leave three decimal places (round to the nearest thousandth). The rank the air samples from highest vapor content to lowest (1 is highest and 6 is lowest). Temp: 14C ; SMR: g/kg ; RH: 90% ; MR: g/kg; Rank: Temp: 20C ; SMR: g/kg ; RH: 60% ; MR: g/kg; Rank: Temp: 24C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 30C ; SMR: g/kg ; RH: 40% ; MR: g/kg; Rank: Temp: 34C ; SMR: g/kg ; RH: 30% ; MR: g/kg; Rank: Temp: 38C ; SMR: g/kg ; RH: 15% ; MR: g/kg; Rank: Please explain how you got the rank number.arrow_forward
- Q3. Air is contained in a tyre tube of: 40 Surface area = 0.5 m2 Wall thickness = 10 mm %3D The pressure of air drops from ( 2.2 bar) to ( 2.18 bar ) in a period of ( 6 days ). The solubility of air in the rubber is ( 0.072 m³ ) of air per m³ of rubber at pressure ( 1.0 bar ). Determine the diffusivity of air in rubber at an operating temperature of ( 300 K ), if the volume of air in a tube is (0.028 m³ ). %3D Take: Gas constant of air = 287 J/ kg.K. ne 8.5r" m21sen 8.55xarrow_forwardCalculate the mass of 600 mL of carbon dioxide collected over water at 25 deg C and 730 mmHg.arrow_forwardThe title of the experiment is the latent heat of evaporation Assume that (10%) of the mass of the shifted vapor is water at a .temperature (T = 100 ° C) It is not steam. What is the percentage of error obtained in the ?experimentarrow_forward
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