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Surface heat and mass transfer coefficients for multiphase porous media transport models with rapid evaporation

Paper ID Volume ID Publish Year Pages File Format Full-Text
19063 43043 2012 16 PDF Available
Title
Surface heat and mass transfer coefficients for multiphase porous media transport models with rapid evaporation
Abstract

Multiphase transport models of food processes require surface heat and mass transfer coefficients as boundary conditions that are traditionally assumed. A conjugate heat and mass transfer model is solved for simple microwave heating of food as a porous medium (from which vapor blows out) with air flow over it, such that there is no need to provide the boundary conditions at the food–air interface. Surface fluxes due to diffusion and flow (blowing) are computed for both vapor and heat from which transfer coefficients are obtained. As evaporation increases with heating, vapor flux due to pressure-driven flow increases but remains small compared with diffusive flux. Vapor accumulation at the interface increases the diffusive flux, leading to an 8% increase in mass transfer coefficient. Heat transfer at the interface occurs through both conduction and flow, and the heat transfer coefficient shows a slight decrease (10%) as blowing increases with heating. The rate of heating has minimal effect on the transfer coefficients.

► Food process modeling requires surface heat and mass transfer coefficients as boundary conditions. ► Evaporation inside food during heating can lead to surface blowing, affecting these coefficients. ► These coefficients are estimated from a conjugate solution involving the food and the surroundings. ► Surface heat transfer coefficient shows a slight (10%) decrease due to blowing from evaporation.

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Surface heat and mass transfer coefficients for multiphase porous media transport models with rapid evaporation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 3, July 2012, Pages 475–490
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us