Journal article
Heat conduction in microbes exposed to pulsed electric fields
IEEE transactions on dielectrics and electrical insulation, Vol.5(6), pp.878-885
12/1998
Handle:
https://hdl.handle.net/2376/112881
Abstract
Nonthermal pasteurization of liquid foods by intense pulsed electric fields results in advantages over conventional heat pasteurization. Thermal damage to liquid foods can adversely affect the flavor and taste and result in loss of nutrients. Numerical modeling of heating parameters near the microbe during exposure to these intense electric fields is described. Boundary conditions at membrane interfaces included the continuity of temperature and continuity of heat flow. Temperature, heat flow vector, and heat source were included in the one-dimensional model. Two simulations are reported here. Simulation 1 consisted of a 0.5 /spl mu/m wide microbe suspended in liquid with conductivity of 0.01 S/m and was treated with an applied electric field of 40 kV/cm for 375 ns. Simulation 2 contained a 1.0 /spl mu/m wide microbe suspended in liquid with conductivity of 0.1 S/m and was treated with an applied electric field of 40 kV/cm for 1 /spl mu/s. Comparison is made with a uniform conductivity model (ohmic), and it is shown that significant differences exist in the heating parameters between the two models. For the parameters used in these one-dimensional simulations, conditions for electroporation were found to exist without a significant temperature rise in the microbe.
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Details
- Title
- Heat conduction in microbes exposed to pulsed electric fields
- Creators
- R.E Bruhn - Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USAP.D PedrowR.G OlsenG.V Barbosa-CanovasB.G Swanson
- Publication Details
- IEEE transactions on dielectrics and electrical insulation, Vol.5(6), pp.878-885
- Academic Unit
- Biological Systems Engineering, Department of; Electrical Engineering and Computer Science, School of; Food Science, School of
- Publisher
- IEEE
- Identifiers
- 99900548370201842
- Language
- English
- Resource Type
- Journal article