Engineering, 10.12.2019 04:31 Haneendye123
Supercritical fluids have some properties of a gas and some properties of a liquid. diffusion coefficients of naphthalene in supercritical carbon dioxide at 35˚c at different pressures were measured by knaff and schlunder (chem. eng. process., 1987 ) with the following values: pressure (bar) d x 108 (m2 /s) 118 1.136 167 0.939 226 0.841 the pressure dependence of the viscosity of supercritical co2 at 35˚c has been correlated, yielding the following equation: 2 6.14 48.8 0.114 p p where viscosity is in cp and pressure is in bar. use the wilke-chang equation to predict the diffusion coefficient of naphthalene in supercritical co2. what conclusions can you draw? does supercritical co2 behave more like a liquid (where the wilke-change equation would be applicable) or more like a gas?
Answers: 1
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
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Engineering, 04.07.2019 18:10
The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false
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Engineering, 04.07.2019 18:10
Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.
Answers: 2
Supercritical fluids have some properties of a gas and some properties of a liquid. diffusion coeffi...
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