Air flowing through a tube of 75-mm diameter passesover a
Chapter 8, Problem 8.121(choose chapter or problem)
Air flowing through a tube of 75-mm diameter passesover a 150-mm-long roughened section that is con-structed from naphthalene having the properties??128.16 kg/kmol and psat(300 K)?1.31?10?4bar.The air is at 1 atm and 300 K, and the Reynolds numberis ReD?35,000. In an experiment for which flow wasmaintained for 3 h, mass loss due to sublimation from theroughened surface was determined to be 0.01 kg. What isthe associated convection mass transfer coefficient? Whatwould be the corresponding convection heat transfercoefficient? Contrast these results with those predicted by conventional smooth tube correlations
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