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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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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container_title Drying technology
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creator Ortiz-Jerez, M. J
Ochoa-Martínez, C. I
description 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.
doi_str_mv 10.1080/07373937.2015.1009538
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source Taylor and Francis Science and Technology Collection
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
title Heat Transfer Mechanisms in Conductive Hydro-Drying of Pumpkin (Cucurbita maxima) Pieces
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