che120c-final-exam08

che120c-final-exam08 - ChE 120C Final June 12, 2008...

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ChE 120C Final “Unless we can know something without knowing every- June 12, 2008 thing, it is obvious that we can never know something.” -Bertrand Russell 1) The generalized drying curve shown below is a useful approximation for the falling rate of drying in many materials. The generalized drying curve depends on an adjustable parameter “ a ” ( a > 1 ) and also depends on the constant rate of drying “R C ”, the equilibrium moisture content “X*”, and the bound water capacity for the material “X C “. Derive the time required in the falling rate regime to to dry from [( X-X* )/( X C -X* )]=1 to [( X-X* )/( X C -X* )]= φ . Express your answer in terms of a simple function of φ and a and the dimensionless time C SC tAR L(X X* ) τ = where L S = dry mass and A = exposed area. 2) In homework 6 you studied fish drying. Approximate a piece of drying fish as a thin slab with skin that is impermeable to water on one side. Air flows past the hanging fish as shown in the figure below. Estimate the overall Sherwood number, “Sh L
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This note was uploaded on 03/04/2012 for the course CHE 120c taught by Professor Ceweb during the Spring '10 term at UCSB.

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che120c-final-exam08 - ChE 120C Final June 12, 2008...

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