{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

che120c-final-exam08

# che120c-final-exam08 - ChE 120C Final"Unless we can know...

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

che120c-final-exam08 - ChE 120C Final"Unless we can know...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online