Fruit Pulp and Skin Dielectric Properties for 150 MHz to 6400 MHz

Seaman, Ronald L.; Seals, J.

doi:10.1080/08327823.1991.11688142

Cited by 34 publications

(17 citation statements)

References 3 publications

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“…With the exception of the last measurements on the internal tissue of Pink Lady apples (Table 3), the values for internal tissues were also nearly constant over the 10-week storage period. Permittivity values obtained in this study agree well with those reported in the literature, when compared at common frequencies of measurement (Ikediala et al, 2000;Tran et al, 1984), and confirm the differences in permittivity values reported for surface and interior tissue measurements on apples (Seaman & Seals, 1991).…”

Section: Resultssupporting

confidence: 93%

“…Dielectric properties of fresh apples have been measured in several studies, including measurements from 300 to 900 MHz on immature and mature apples (Thompson & Zacharia, 1971), and measurements from 100 MHz to 12 GHz (Tran, Stuchly, & Kraszewski, 1984). Measurements on fresh apples, both on external surfaces and exposed flesh, were reported for the 150 MHz to 6.4 GHz range (Seaman & Seals, 1991), and measurements on internal tissues of the same three cultivars over the range from 200 MHz to 20 GHz were also reported (Nelson, Forbus, & Lawrence, 1994a, 1994b. Dielectric properties of four apple cultivars were also measured over the 30 MHz to 3 GHz range in connection with codling moth control studies (Ikediala, Tang, Drake, & Neven, 2000).…”

Section: Introductionmentioning

confidence: 98%

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10–1800-MHz dielectric properties of fresh apples during storage

Guo

Nelson

Trabelsi

et al. 2007

Journal of Food Engineering

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 98%

10–1800-MHz dielectric properties of fresh apples during storage

Guo

Nelson

Trabelsi

et al. 2007

Journal of Food Engineering

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“…This is in agreement with results reported by Seaman and Seals (1991) in which a large difference was observed between the DPs of pulp and skin of GD apples measured from 150 to 6400 MHz. Similarly in peach, a large difference was observed in DPs between peel and pulp (Fig.…”

Section: Dielectric Propertiessupporting

confidence: 95%

“…Sipaghioglu and Barringer (2003) expressed DPs of fruits and vegetables as a function of temperature, ash, and moisture content. Seaman and Seals (1991) measured the DPs (0Á15-6Á4 GHz) of peel and pulp of apples and oranges at room temperature and they reported a large difference in DPs between pulp and peel. However, no data have been reported for fruit peel at 27.12 MHz frequency.…”

Section: Introductionmentioning

confidence: 98%

Characterization of radio frequency heating of fresh fruits influenced by dielectric properties

Birla

Wang

Tang

et al. 2008

Journal of Food Engineering

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a b s t r a c tBecause of its fast and volumetric nature, radio frequency (RF) heating has been looked upon as a way to overcome the problems associated with conventional heating methods used for disinfestation of fruits. But non-uniform heating within fruits is a major obstacle in adaptation of this technology. In this study, RF heating patterns influenced by dielectric properties (DPs) of fruits were investigated both experimentally and mathematically. A computer simulation model was developed using FEMLAB 3.4, a commercial software for solving Maxwell's electromagnetic and Fourier's heat transfer equations. Orange, apple, grapefruit, peach, and avocado fruits, selected for these studies were subjected to RF heating in a water filled container equipped with a mechanism to keep fruits rotating and moving during RF heating in a 27.12 MHz, 12 kW parallel plate RF unit. DPs of constitutional parts of the selected fruits were measured by open-ended coaxial probe method. The study showed that dissimilarity in peel and pulp DPs greatly influenced the RF heating behavior of the fruits. Core heating was prominent in apple, peeled orange and grapefruit; whereas subsurface/peripheral heating in whole oranges and grapefruit, and avocado. The computer model was an effective tool in characterizing and explaining the heating patterns in the fruits based on DPs. The study helped in better understanding the complex RF heating characteristics of fruits, which may be useful in assessing the design feasibility of product specific RF energy based treatment protocol.

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“…The dielectric properties of several foods have been measured in previous works as a function of frequency, temperature or moisture content (Bengtsson & Risman, 1971;Changmin & Sakai, 1999;Fasina, Farkas, & Fleming, 2003;Funebo & Ohlsson, 1999;Goedeken, Tong, & Virtanen, 1997;Guan, Cheng, Wang, & Tang, 2004;Hao, Juming, & Cavalieri, 2002;Kent, 1987;Mao, Watanabe, & Sakai, 2003a, Mao, Watanabe, & Sakai, 2003bMartín et al, 1999;Nelson, 1992Nelson, , 2003Nelson & Bartley, 2000;Nelson, Forbus, & Lawrence, 1994;Seaman & Seals, 1991;Sharma & Prasad, 2002;Sipahioglu, Barringer, Taub, & Prakash, 2003;Tran, Stuchly, & Kraszewski, 1984). Discrepancies found in the published values for the dielectric constant and loss factor of similar foods arose partly from the different measuring techniques employed.…”

Section: Introductionmentioning

confidence: 98%