Computer simulation of radio frequency selective heating of insects in soybeans

Huang, Zhi; Chen, Long; Wang, Shaojin

doi:10.1016/j.ijheatmasstransfer.2015.06.071

Cited by 58 publications

(22 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The larger resolution of the scanning is not a problem for the stability of the FDTD algorithm, but more spatial resolution could be obtained with the same simulation settings. It is expected that the micro-CT models used in this study lead to a better estimation of P abs and the spatial distribution of the electric fields than approximate models such as ellipsoids or cylinders 37 .…”

Section: Discussionmentioning

confidence: 99%

Radio-Frequency Electromagnetic Field Exposure of Western Honey Bees

Thielens

Greco

Verloock

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Radio-frequency electromagnetic fields (RF-EMFs) can be absorbed in all living organisms, includingWestern Honey Bees (Apis Mellifera). This is an ecologically and economically important global insect species that is continuously exposed to environmental RF-EMFs. This exposure is studied numerically and experimentally in this manuscript. To this aim, numerical simulations using honey bee models, obtained using micro-CT scanning, were implemented to determine RF absorbed power as a function of frequency in the 0.6 to 120 GHz range. Five different models of honey bees were obtained and simulated: two workers, a drone, a larva, and a queen. The simulations were combined with in-situ measurements of environmental RF-EMF exposure near beehives in Belgium in order to estimate realistic exposure and absorbed power values for honey bees. Our analysis shows that a relatively small shift of 10% of environmental incident power density from frequencies below 3 GHz to higher frequencies will lead to a relative increase in absorbed power of a factor higher than 3.Wireless communication is a widespread and growing technology. Most of the wireless networks and personal devices operate using Radio-Frequency (RF) electromagnetic fields (EMFs). The current networks rely on frequencies between 0.1 GHz and 6 GHz 1 . These EMFs can be absorbed in dielectric media and can cause dielectric heating 2 . This dielectric heating can occur in any living organism, including insects.Absorption of RF EMFs in insects has been studied previously. Wang et al. 3 studied absorption of RF EMFs in mashed codling moth larvae at 27 MHz and 915 MHz. Shrestha et al. 4 studied dielectric heating of Cryptolestes ferrungineus S. in different stages (eggs, larvae, pupae, and adults) at 27 MHz. Shayesteh et al. 5 exposed Tribolium confusum and Plodia interpunctella to RF EMFs at 2450 MHz 6-8 . are reviews of RF heating of insects. Dielectric porperties of insects are measured by Nelson et al. 9 from 0.2 to 20 GHz through the determination of loss of RF EMF power in insect samples (rice weevil, red flour beetle, saw-toothed grain beetle, and lesser grain borer). Absorption of RF EMFs was studied by Halverson et al. 10 in insects between 10-50 GHz. Thielens et al. 11 used numerical simulations to study absorption of RF EMFs from 2-120 GHz in four insect models. The main conclusions from the aforementioned studies are that (i) RF EMFs can be absorbed and can cause dielectric heating in insects and (ii) this absorption of RF-EMFs is frequency dependent. This frequency dependency is important since 5th generation (5 G) networks are expected to partially operate at higher frequencies (up to 300 GHz) 12,13 . This shift might induce a change in RF EMF absorption for insects 11 .Western Honey Bees (Apis Mellifera) are particularly important insects because of the environmental and economical importance of this species. Therefore, previous studies have focused on the potential effects of EMF exposure of Western Honey Bees. Low-frequency EM properties and exposure of ho...

show abstract

Section: Discussionmentioning

confidence: 99%

Radio-Frequency Electromagnetic Field Exposure of Western Honey Bees

Thielens

Greco

Verloock

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The cold spot temperature (50°C) was used as the target one by considering the potential application of RF energy to control insects, and 7 min of RF heating was needed for the geometric centre (cold spot) from ambient temperature (20°C) to 50°C with soybeans moisture content of 4.64% w.b. based on our preliminary tests (Huang, Chen, & Wang, 2015). Therefore, for all cases with different moisture content of soybeans placed in various thicknesses of polypropylene and polystyrene containers, 7 min RF heating was selected and used in the following computer simulation study to make it easy for comparison and analysis.…”

Section: Rf Experimentsmentioning

confidence: 99%

Computational modelling of the impact of polystyrene containers on radio frequency heating uniformity improvement for dried soybeans

Huang

Zhang

Marra

et al. 2016

Innovative Food Science & Emerging Technologies

Self Cite

View full text Add to dashboard Cite

“…Because of higher penetration depth compared to microwaves due to relatively lower frequency and longer wavelength, RF heating is suitable for treating large bulk food products. RF heating process has shown potential in pasteurization of milk (Awuah et al, 2005), meats (Schlisselberg et al, 2013), and spices (Jeong and Kang, 2014;Kim et al, 2012); disinfestations in various agricultural commodities, such as chestnuts (Hou et al, 2014(Hou et al, , 2015, walnuts (Mitcham et al, 2004;Wang et al, 2001), almonds (Wang et al, 2013), dried fruits (Alfaifi et al, 2014), fresh fruits (Birla et al, 2004(Birla et al, , 2008Wang et al, 2006), soybeans (Huang et al, 2015a), and wheat (Jiao et al, 2015); and thawing and cooking meat (Laycock et al, 2003;Wang et al, 2012). The food products processed with RF heating also show higher (Fiore et al, 2013) or similar (Tang et al, 2005) nutritional values, and better functional properties (Boreddy et al, 2014(Boreddy et al, , 2016) when compared to those products cooked conventionally.…”

Section: Introductionmentioning

confidence: 99%

Modeling radio frequency heating of food moving on a conveyor belt

Chen

Lau

Chen

et al. 2017

Food and Bioproducts Processing

Self Cite

View full text Add to dashboard Cite

A multiphysics model that coupled electric fields and heat transfer was developed to simulate the radio frequency (RF) heating of food moving on a conveyor belt. A discrete moving step approach was used in the simulation. The total power absorption increased considerably during the entry of the sample into the RF system, remained stable when the sample was fully covered by the top and bottom electrodes, and decreased when the sample moved out of the system. Edge and corner heating was observed from the power absorption distribution and electric field distribution. The model was validated by heating a rectangular container of wheat kernels moving on a conveyor belt in a RF system (27.12 MHz, 6 kW). The predicted spatial temperatures in top, middle, and bottom layers showed less than 3.5 °C lower prediction than the experimental result. The measured anode current showed a good linear correlation with the predicted total power absorption. The optimum number of discrete moving steps was determined to be nine for accurate temperature prediction with total conveyor belt movement distance of 1.13 m which is equivalent to optimize step size of 0.1256 m/step (0.3 m for entry and exit, respectively, and 0.53 m for fully covered by electrodes) at speed of 14.23 m h-1. The movement of food product could help improve the heating uniformity of RF heating process.

show abstract

Computer simulation of radio frequency selective heating of insects in soybeans

Cited by 58 publications

References 43 publications

Radio-Frequency Electromagnetic Field Exposure of Western Honey Bees

Radio-Frequency Electromagnetic Field Exposure of Western Honey Bees

Computational modelling of the impact of polystyrene containers on radio frequency heating uniformity improvement for dried soybeans

Modeling radio frequency heating of food moving on a conveyor belt

Contact Info

Product

Resources

About