Heat Transfer Mechanisms in Conductive Hydro-Drying of Pumpkin (Cucurbita maxima) Pieces

Pumpkin pieces were dehydrated by conductive hydro-drying using the Refractance Window (RW) technology. The water bath temperature was fixed at 90 ± 2°C and the drying was carried out for 5 h. This study evaluated the convective effects of heat transfer by natural convection (NC) and forced convecti...

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Bibliographic Details
Published in:Drying technology 2015-06, Vol.33 (8), p.965-972
Main Authors: Ortiz-Jerez, M. J, Ochoa-Martínez, C. I
Format: Article
Language:English
Subjects:
air
aluminum foil
analysis of variance
Biotechnology
Convection
Cucurbita maxima
Drying
Drying agents
Fluid dynamics
Heat transfer
Moisture content
Mylar
Pumpkins
Samples
Statistical analysis
Statistical methods
temperature
Temperature distribution
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Summary:Pumpkin pieces were dehydrated by conductive hydro-drying using the Refractance Window (RW) technology. The water bath temperature was fixed at 90 ± 2°C and the drying was carried out for 5 h. This study evaluated the convective effects of heat transfer by natural convection (NC) and forced convection (FC) due to the air in the top of the sample and the conductive effects on a Mylar sheet (MY) and a Mylar sheet covered with aluminum foil (MY/AL). Temperatures were measured at three sample points (bottom, middle, and top) during drying. The highest and lowest average temperatures were observed in NC-MY and FC-MY, respectively. The highest and lowest drying rates were obtained in FC-MY/AL and NC-MY, respectively. Analysis of variance indicated that the convection and convection–film interaction were statistically significant. Heat transfer due to the different mechanisms in the involved systems (water, drying film, product, and air) was examined.
ISSN:1532-2300
0737-3937
1532-2300
DOI:10.1080/07373937.2015.1009538