Temperature profile of rice grain during its heating in the domestic microwave oven
Keywords:
Microwave puffing, microwave power absorption density, rice puffing.Abstract
Microwave puffing is an alternative of the sand and air puffing. Microwave heating of rice grain during its puffing in domestic microwave oven was modeled using finite element based COMSOL multiphysics 3.3a software. The 3D-geometry, consisting oven, waveguide, turntable and rice grain in oven, was drawn. A multiphysics model was developed by coupling the electromagnetic wave and general heat transfer modules. The Maxwell’s equation of electromagnetics was solved for the electric field inside the oven cavity and the rice grain. The energy equation was solved for the temperatures profile inside the rice grain. Uneven heating of rice was observed that was influenced by the placement of rice grain on the turntable of the microwave oven. Rice grain, placed in the radial zones of 0 - 2.5 cm, 12.5-15 cm and 8.75-11.25 cm, did not absorb sufficient microwave energy, which resulted in mostly unpuffed or semi puffed rice. Rice grains placed in the puffing zone of 3.75 to 6.25 cm was absorbed sufficient energy and crossed glass transition temperature in 13-14 s, which resulted in mostly puffed rice. Apart from the location of puffing zone and heating time, revolution of rice grain on the turn table and the distribution of electromagnetic field also influenced the heating pattern.
References
Buffler, C. 1993. Microwave Cooking and Processing. Engineering Fundamentals for the food Scientist. New York: Avi Book, pp 6-7
Campañone, L. A., Paola, C. A., and Mascheroni, R. H. 2012. Modeling and simulation of microwave heating of foods under different process schedules. Food and Bioprocess Technology, 5(2): 738–749.
Chandrasekaran, S., Ramanathan, S., and Basak, T. 2013. Microwave food processing: A review. Food Research International, 52: 243–261.
Chandrasekhar, P.R. and Chattopadhyay, P.K. 1988. Heat transfer during fluidized bed puffing of rice grains. Journal of Food Process Engineering, 11(2): 147-157.
Chung, H. J., Lee, E. J., and Lim, S. T. 2002. Comparison in glass transition and enthalpy relaxation between native and gelatinized rice starches. Carbohydrate Polymers, 48(3): 287–298.
Datta, A. K., Sumnu, G., and Raghavan, G. S. V. 2005. Dielectric properties of foods. In M. A. Rao, S. S. H. Rizvi, and A. K. Datta (Eds.), Engineering properties of foods (Vol. 3, pp. 501–557). Boca Raton, FL: CRC Press.
Dibben, D. 2001. Electromagnetics: Fundamental Aspects and Numerical Modeling. In A. K. Datta and R. C. Anantheswaran (Eds.), Handbook of microwave technology for food applications (pp. 33–68). Marcel Dekker.
Geedipalli, S. S. R., Rakesh, V., and Datta, A. K. 2007. Modeling the heating uniformity contributed by a rotating turntable in microwave ovens. Journal of Food Engineering, 82(3): 359-368.
Gulati, T., and Datta, A. K. 2016. Coupled multiphase transport, large deformation and phase transition during rice puffing. Chemical Engineering Science, 139: 75-98.
Kumar, A., and Shrivastava, S. L. 2019. Temperature, concentration, and frequency dependent dielectric properties of pineapple juice relevant to its concentration by microwave energy. Journal of Food Process Engineering, 42(3): e13013.
Lata, S., Swarnakar, A. K., Kumar, A., and Das, S. K. 2023. Effects of mode of heat transfer on puffing quality of rice grain: A modeling and simulation analysis. Journal of Food Process Engineering, e14323.
Mohapatra, M., Kumar, A., and Das, S. K. 2012. Mixing characteristics of rice by tracer technique in an agitated cylindrical preconditioner developed for puffed rice production system. Journal of Food Process Engineering, 35(5): 1–8.
Murugesan, G. and Bhattacharya, K. R. 1986. Studies on puffed rice. I. Effect of processing conditions. Journal of Food Science and Technology, 23(4): 97-202.
Rajha, H. N., Debs, E., Abi Rached, R., El Khoury, K., Al-Kazzi, M., Mrad, R., and Louka, N. 2021. Innovation in cannon puffing technology for the homogenization of bulk treatment: Half-popped purple corn, a new healthy snack. Journal of Food Process Engineering, 44(6): e13695.
Salvi, D., Boldor, D., Aita, G. M., and Sabliov, C. M. 2011. COMSOL multiphysics model for continuous flow microwave heating of liquids. Journal of Food Engineering, 104: 422–429.
Sumnu, G., and Sahin, S. 2005. Recent development in microwave heating. In D.-W. Sun (Ed.), Emerging technology for food processing (Vol. 16, pp. 419–444). London: Elsevier Academic Press.
Swarnakar, A. K., Devi, M. K., and Das, S. K. 2014. Popping characteristics of paddy using microwave energy and optimization of process parameters. International Journal of Food Studies, 3(1).
Zhang, H., and Datta, A. K. 2001. Electromagnetics of microwave heating: Magnitude and uniformity of energy absorption in an oven. In A. K. Datta and R. C. Anantheswaran (Eds.), Handbook of microwave technology for food applications (pp. 33–68). Marcel Dekker.
Zheng, X., Wang, Y., Liu, C., Sun, J., Liu, B., Zhang, B., Lin, Z., Sun, Y., and Liu, H. 2013. Microwave energy absorption behavior of foamed berry puree under microwave drying conditions. Drying Technology, 31(7): 785–794.
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