Czech J. Food Sci., 2001, 19(3):111-120 | DOI: 10.17221/6586-CJFS

Temperature profiles in microwave heated solid foods of slab geometry: Influence of process parameters

J. Hou¹ová, K. Hoke
Food Research Institute Prague, Prague, Czech Republic

A simple 1-D mathematical model for prediction of local temperatures in a layer of solid material during microwave heating (Hou¹ová et al. 1998) and a sensitivity analysis were used to evaluate the influence of process and material parameters on vertical temperature profiles in a layer of material during heating. The results of calculations are presented in graphs and discussed. The incident microwave power and heat capacity and density of heated material are parameters with great effect on all local and average temperatures and local and average heating rates. The shape of temperature profile is influenced only to a small extent by a change in the value of applied microwave power and also in the value of heat capacity or density of heated material. The whole profiles shift to higher or lower temperature values when the incident microwave power is changing. The distribution of applied microwave power between the upper and bottom layer surface very much influences the shape of the profile and the values and position of the highest and the lowest temperature in the layer. Depth of penetration and thermal conductivity of heated material influence on the shape of temperature profiles and the temperature spread in the layer (evenness of temperature distribution). Effect of penetration depth also depends on the relation to the layer thickness - its effect increases with the increasing layer thickness. At the low values of penetration depth relative to the layer thickness, an uneven temperature profile is to be expected. Effect of thermal conductivity value on temperature profile depends on the time of heating. Because of a short time of microwave heating, the effect of this parameter on temperature distribution is smaller compared to the conventional heating methods. At the beginning of heating its influence is quite negligible. Temperature of the air surrounding the layer and intensity of heat exchange between the air and layer surface are parameters with only small local effect on temperature distribution.

Keywords: microwave heating; temperature distribution; temperature profile

Published: June 30, 2001  Show citation

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Hou¹ová J, Hoke K. Temperature profiles in microwave heated solid foods of slab geometry: Influence of process parameters. Czech J. Food Sci. 2001;19(3):111-120. doi: 10.17221/6586-CJFS.
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    References

    1. ANANTHESWAREN R.C., LIN L. (1994): Effect of viscosity and salt concentration on microwave heating of model nonnewtonian liquid foods in a cylindrical container. Int. Microwave Power Inst., 29: 119–126. Go to original source...
    2. AYAPP K.G., DAVIS H.T., CRAPISTEE G., DAVIS A.E., GORDON J. (1991): Microwave heating: An evaluation of power formulation. Chem. Eng. Sci., 46: 1005–1016. Go to original source...
    3. BOWS J.R., RICHARDSON P.S. (1990): Effect of component configuration and packaging materials on microwave reheating a frozen three-component meal. Int. J. Food. Sci. Technol., 25: 538–550. Go to original source...
    4. B URFOOT D., J AMES S.J., F OSTER A.M., S ELF K.P., WILKINS T.J., PHILIPS I. (1991): Temperature uniformity after reheating in domestic microwave ovens. In: Proc. Process Engineering in the Food Industry Conf., Elsevier Appl. Sci.
    5. DOLANDE J., DATTA A. (1993): Temperatures profiles in microwave heating of solids: a systematic study. J. Microwave Power Elgm. Energy, 28: 58–66. Go to original source...
    6. CHEN X.D. (1998): Microwave heating of an infinite slab and its thermal stability analysis. J. Food Eng, 35: 339–349. Go to original source...
    7. HOUŠOVÁ J., HOKE K., TOPINKA P. (1994): Distribution and profiles of local temperatures in homogeneous materials during microwave heating. Potrav. Vìdy, 12: 393–406.
    8. HOUŠOVÁ J., HOKE K. (1995): Microwave heating of heterogeneous food product – heating rate and temperature uniformity. Potrav. Vìdy, 13: 111–129.
    9. HOUŠOVÁ J., HOKE J., TOPINKA P. (1998): Temperature distribution in layer of food heated by microwaves. Czech J. Food Sci., 16: 179–188.
    10. NYKVIST W.E., DECAREAU R.V. (1976): Microwave meat roasting. J. Microwave Power, 11: 3–24. Go to original source...
    11. OHLSSON T., BENGTSSON N. (1971): Microwave heating profiles in foods. Microwave Energy Appl. Newsl., 4: 1–8.
    12. PONNE C.T. (1996): Interaction of electromagnetic energy with vegetable food constituents. [Dissertation.] Eindhoven University of Technology, Eindhoven.
    13. PROSETYA H., DATTA A. (1991): Batch microwave heating: an experimental study. Int. Microwave Power Inst., 26: 2l5–226. Go to original source...
    14. RAMASWAMY H.S., PILLET-WILL T. (1992): Temperature distribution in microwave – heated food models. J. Food Quality, 15: 445–438. Go to original source...
    15. TONG C.H., LUND D.B. (1989): Modelling thermal and moisture profiles in foods during microwave heating. In: Proc. MW Foods ’89 Conf., Chicago. Recived for publication July 22, 2000

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