| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Research Abstract |
The methods of heating of foods are influenced for the quality of heated foods. Infrared heating is used on drying or baking of foods in the food industry or domestic cooking, but there was no theoretical data on the characteristics of infrared heating of food. So, in 992, we carried out the investigation about baking of food with both convection rich heating condition and radiative rich condition. As the results, infrared heating, radiative rich condition, was effective in temerature raising of food surface.
In 1993, to clarify the reason of this phenomenon, three parts of investigations were carried. First, the measurement of temperature distribution in the near part of surface was carried out with the thermocouple which had 12 measure points during 7mm width. Second, the distribution of temperature was calculated under the assumption which the heat transfer only by the heat conductivity. comparing with the measurement value and calculated value, the penetration of the infrared into the food surface was suggested. Third, the transmitances of thin layr samples of food at every spectra of infrared were measured.
As the results of agar gel, cornstarch gel and fish paste, the measured temperatures of near surface of these food models were higher than the calculated values. From these phenomena, the penetration of the infrared ray in the surface of food could be inferred. The penetration depth was deeper in short range of wave length. This was supported by the results of measurement of transmitances.
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