Publicación: MATHEMATICAL CORRELATION TO GET MASS TRANSFER COEFFICIENT IN SOLIDS DRYING
Fecha
2007
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MADERAS: CIENCIA Y TECNOLOGIA
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A MATHEMATICAL CORRELATION TO DETERMINE THE MASS COEFFICIENT, DURING THE EVAPORATION OF WATER FROM A WET SURFACE, WAS DEVELOPED FOR THEIR APPLICATION IN WET AIR WITH LOW PSYCHOMETRIC DIFFERENTIAL AND WITH AIR TEMPERATURE ABOVE 60ºC.
THE CLASSIC THEORY THAT HAS BEEN USED IN ORDER TO GET HEAT AND MASS CONVECTIVE COEFFICIENTS, THROUGH NON-DIMENSIONAL PARAMETERS AND PHENOMENOLOGICAL ANALOGIES, TURNS OUT TO BE VALID ONLY FOR DRY AIR.
IN THE PARTICULAR CASE OF SOLIDS DRYING, WHERE OPERATION REQUIRES TO BE PERFORMED UNDER CONTROLLED DRYING RATES, IN ORDER TO PREVENT PHYSICAL DAMAGE FROM AFFECTING THE PRODUCT, IS NECESSARY TO OPERATE ON A WET BULB TEMPERATURE ABOVE 40ºC OR AT MODERATE PSYCHOMETRIC DIFFERENTIAL. WHEN WE WORK UNDER THOSE RANGES OF TEMPERATURE, THE EXPRESSIONS THAT RELATE HEAT AND MASS CONVECTIVE COEFFICIENTS SHOW ERRORS BETWEEN 26% AND 113% FOR WET TEMPERATURE BETWEEN 30ºC AND 70ºC AND PSYCHOMETRIC DIFFERENCE OF 30ºC.
THE EXPRESSION THAT HAS BEEN GIVEN FOR THIS APPLICATION IS STATED AS A FUNCTION OF THE FOLLOWING: HEAT TRANSFER COEFFICIENT, WET BULB TEMPERATURE, AND PSYCHOMETRIC DIFFERENTIAL.
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