论文信息 - PERFORMANCE MODELS FOR CONTINUOUS DIELECTRIC PASTEURIZATION OF MILK

PERFORMANCE MODELS FOR CONTINUOUS DIELECTRIC PASTEURIZATION OF MILK

The steady-state performance of a continuous parallel-plate heat exchanger was generally predicted for nonfat milk solutions of measured conductivity by a model equation obtained from energy balance on the exchanger. Electrical properties of the milk were determined from the Hasted-Debye models for aqueous ionic solutions. Heating characteristics of an experimental exchanger agreed closely with predicted values for various flow rates and voltage gradients at temperatures of interest in pasteurization of biological fluids. Such models could be employed in the development of electrical pasteurization or sterilization processes for a variety of food products. Electrical heating processes would reduce thermal denaturation of heat-labile food constituents, as compared with conventional heating processes, due to rapid heat penetration, uniform heating and low surface temperatures and would give products of improved nutritional value and organoleptic quality. Theoretical considerations also suggest that higher thermal death rates would be obtained for vegetative microbial contaminants at process temperatures and holding times comparable to those of conventional heating processes.

Richard E. Mudgett

[1] H. Fleming. Effect of high-frequency fields on micro-organisms , 1944, Electrical Engineering.

[2] W. B. Westphal,et al. PREDICTION OF DIELECTRIC PROPERTIES IN SOLID FOODS OF HIGH MOISTURE CONTENT AT ULTRAHIGH AND MICROWAVE FREQUENCIES , 1977 .

[3] S A Goldblith,et al. Effect of Microwaves on Escherichia coli and Bacillus subtilis. , 1967, Applied microbiology.

[4] D. Ritson,et al. Dielectric Properties of Aqueous Ionic Solutions. Parts I and II , 1948 .

[5] D. Ritson,et al. The Dielectric Properties of Water and Heavy Water , 1948 .

[6] E. Carstensen,et al. Dielectric Study of the Physical State of Electrolytes and Water Within Bacillus cereus Spores , 1971, Journal of bacteriology.

[7] R. Mudgett,et al. PREDICTION OF DIELECTRIC PROPERTIES IN OIL-WATER AND ALCOHOL-WATER MIXTURES AT 3,000 MHz, 25°C BASED ON PURE COMPONENT PROPERTIES , 1974 .

[8] H. Fricke,et al. The Complex Conductivity of a Suspension of Stratified Particles of Spherical or Cylindrical Form , 1955 .

[9] A. C. Smith,et al. Prediction of dielectric properties in nonfat milk at frequencies and temperatures of interest in microwave processing , 1974 .