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Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
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TITLE |
Development of Process
Equipment to Separate Nonthermal and Thermal
Effects of RF Energy on Microorganisms [PDF] |
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AUTHORS |
C. Brunkhorst, D. Ciotti, D. J. Geveke and M. Kozempel 2000 35 1 44-50 |
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Abstract We developed a modified radio
frequency (RF) dielectric heater, as a component of a continuous process, for
isolating thermal and nonthermal effects of RF
energy on microorganisms in liquid foods. The
concept combines instantaneous input of RF energy to the food system with
rapid removal of thermal energy. We used a double tube heat exchanger as an
integral part of the RF heater. The outer tube was Teflon. The inner tube was
stainless steel which was grounded in the RF circuit. Product flowed through
the annular region between the two concentric tubes. Cooling water flowed
through the grounded stainless steel tube. The RF energy was absorbed by the
process fluid in the annular region. The cooling water flowing in the inner
tube removed the thermal energy from the process fluid controlling the
temperature. Key Words: Radio frequency, nonthermal, pasteurization |
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