Modeling fruit internal heating rates for hot air and hot water treatments

Wang, S.; Tang, Juming; Cavalieri, Ralph P.

doi:10.1016/s0925-5214(01)00085-0

Cited by 117 publications

(77 citation statements)

References 26 publications

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“…The water�air interface in the con� tainer was assigned to a convective heat transfer bound� ary condition. The convective heat transfer coefficient was assumed to be 20 W m -2 K -1 for water�air and con� tainer�air interfaces (Wang, Tang & Cavalieri, 2001). At fruit�water and container wall�water interfaces no�slip boundaries were imposed in the momentum equations.…”

Section: Geometric Model and Boundary Conditionsmentioning

confidence: 99%

Computer simulation of radio frequency heating of model fruit immersed in water

Birla

Wang

Tang

2008

Journal of Food Engineering

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140

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Section: Geometric Model and Boundary Conditionsmentioning

confidence: 99%

Computer simulation of radio frequency heating of model fruit immersed in water

Birla

Wang

Tang

2008

Journal of Food Engineering

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140

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“…This resistance to the rapid movement of the bipolar molecules creates friction and results in heat dissipation in the material exposed to the microwave radiation (Brygidyr, 1977). This electromagnetic energy interacts directly with the commodity's interior to quickly raise the center temperature (Tang et al, 2000;Wang et al, 2001a;2001b). Therefore, an effective way of killing insects of all kinds is to elevate their body temperature above a certain lethal value using microwave energy (Tilton, 1987).…”

Section: Introductionmentioning

confidence: 99%

Non-chemical alternatives to methyl bromide against Ephestia cautella (Lepidoptera: Pyralidae): microwave and ozone

Abo-El-Saad¹,

El-Shafie²

2011

ABJNA

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ABSTRACT:Multiple microwave power (MP) has been applied against Ephestia cautella (Walker) at various exposure times. Five seconds exposure time at various MP up to 60% had no effect on insect mortality, by increasing the MP up to 100%, the mortality reached 20% for larvae and 33% for adults. When exposure time was increased to 15 seconds with different MP, mortality reached 100% and 80% at 60% power for adults and larvae, respectively. Eggs of E. cautella were exposed to various MP at different time; the hatchability reached 0.0 % after 10 and 15 seconds at 100% MP. Data showed microwave had no effect on soluble proteins isolated from dates treated by microwave at various time up to 15 seconds, and had no effect on protein pattern on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Ozonation with 2.0 ppm ozone generated with various time 4, 8 and 12 hours, gave 28%, 73%, and 83% mortality against adults, while it gave 10%, 20% and 27% mortality against larvae. Ozone exhibited less effect against pupae and eggs hatchability. The possibility of using microwave and ozone in integrated management program against stored product pests is discussed.

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“…However, accomplishing disinfestation without causing deleterious effects to fruit quality is a challenging task (Armstrong, 1994). In conventional heating with water or air, the rate of thermal energy delivered to the interior of the commodities is significantly influenced by fruit size (Wang et al, 2001b). Fresh fruit are sensitive to heat and often a slight deviation from the required time and temperature would result in either unacceptable fruit quality or insect survival.…”

Section: Introductionmentioning

confidence: 99%

Postharvest treatment to control codling moth in fresh apples using water assisted radio frequency heating

Wang

Birla

Tang

et al. 2006

Postharvest Biology and Technology

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Apples destined for export to Japan and South Korea are currently disinfested for codling moth, Cydia pomonella L. (Lepidoptera: Tortricidae), using methyl bromide fumigation. Restrictions and limitations imposed on the uses of methyl bromide have increased interest in developing alternative non-chemical quarantine treatments. It is imperative that the treatment is effective against codling moth yet maintains the quality of treated apples. The present study explored the application of radio frequency (RF) energy in conjunction with conventional hot water treatment to develop feasible heat treatments. Treatment parameters were selected based on minimum time-temperature conditions required for 100% mortality of fifth-instar codling moth and apple quality. The treatments included preheating of infested or wholesome apples in warm water at 45• C for 30 min. The preheated apples were then heated to 48• C in a hydraulic fruit mover placed between two parallel plate electrodes in a 12 kW, 27.12 MHz pilot scale RF system. RF treated apples were transferred to a 48• C hot water bath and held for 5, 10, 15 and 20 min before being hydro-cooled in ice water for 30 min. The mortality of codling moths in the infested apples was assessed, and the quality of wholesome apples was evaluated by measuring weight loss, firmness, color, soluble solids content, and titratable acidity after 0, 7, and 30 days of storage at 4• C. The results showed that the treatment at 48• C for 15 min was the most practical and effective both for insect control and apple quality.

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Modeling fruit internal heating rates for hot air and hot water treatments

Cited by 117 publications

References 26 publications

Computer simulation of radio frequency heating of model fruit immersed in water

Computer simulation of radio frequency heating of model fruit immersed in water

Non-chemical alternatives to methyl bromide against Ephestia cautella (Lepidoptera: Pyralidae): microwave and ozone

Postharvest treatment to control codling moth in fresh apples using water assisted radio frequency heating

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