Analysis on the effect of polyetherimide on energy distribution of radio frequency heating of viscous sauce
Author:
Shi Huojie123, Chen Hui4, Yan Zhiming5
Affiliation:
1. College of Mechanical and Electrical Engineering , Fujian Agriculture and Forestry University , Fuzhou 350002 , China 2. Post-Doctoral Research Center of Mechanical Engineering of Fuzhou University , Fuzhou , China 3. Post-Doctoral Workstation of Fujian Haiyuan Composite Materials Co., Ltd , Fuzhou , China 4. College of Mechanical Engineering , Fuzhou University , Fuzhou 350108 , China 5. College of Food Science and Technology , Fujian Agriculture and Forestry University , Fuzhou 350002 , China
Abstract
Abstract
Radio frequency (RF) sterilization of low-moisture, high-oil, high-protein, and viscous sauces for instant food (LHHVS) demonstrates many advantages, but uneven heating is a main problem that must be addressed. Main factors that affect heating uniformity are generally considered dielectric properties, shape and size of the sample and its position relative to the electrode plate, in addition the structure and voltage of RF electrode. A method based on texture characteristics of the solid–gel–liquid mixing system of LHHVS for adjustment and control of energy distribution in the RF field is proposed in this study to improve the heating uniformity. First, energy conversion principles and control equations of RF heating were analyzed on the basis of dielectric theory. Second, the influence of RF electromagnetic field-medium polyetherimide (PEI) on the RF heating of peanut butter (RHPB) was investigated on the basis of the numerical model of RHPB that was verified through experiments. Finally, the influence mechanism and its regulation and control effect were analyzed and discussed. The following conclusions can be drawn from this study: the increase of electrode gaps exerts minimal effect although it reduces the unevenness of the energy distribution. However, RF heating protocols must use the smallest possible electrode gap to heat agrifoods and increase the heating rate significantly. The energy distribution on the part of the sample close to PEI varies with the change of geometry and size of PEI when its placement is bias or symmetric. The area of energy enhancement continues to expand where the sample is in contact with PEI as PEI gradually increases. The area where the temperature increases under the influence of PEI will expand along the direction of the sample radius when the thickness of PEI remains unchanged and the radius gradually enlarges; otherwise, it will expand along the direction of the sample thickness. The influence of PEI on the energy distribution of RHPB demonstrates local characteristics. PEI significantly influences the energy distribution and heating mode of RHPB, which is easy to adjust and control, but does not reduce the processing speed and does not increases energy consumption. Hence, PEI is an effective means to interfere with energy distribution of RHPB. Uniform energy distribution can be obtained by selecting the appropriate PEI shape and size. Results of this study can help determine the experimental protocol for RHPB with the optimal uniform distribution and promote the fast commercial application of this technology.
Publisher
Walter de Gruyter GmbH
Subject
Engineering (miscellaneous),Food Science,Biotechnology
Reference28 articles.
1. Richard, P, Elena, E, Warren, S, Black, D, Elliott, P. Sources and risk factors for contamination, survival, persistence, and heat resistance of Salmonella in low-moisture foods. J Food Protect 2010;73:1919–36. https://doi.org/10.4315/0362-028x-73.10.1919. 2. Scott, VN, Chen, Y, Freier, TA, Kuehm, J, Moorman, M, Meyer, J, et al.. Control of Salmonella in low-moisture foods. I. Minimizing entry of Salmonella into a processing facility. Food Protect Trends 2009;29:342–53. 3. Goodridge, LD, Willford, J, Kalchayanand, N. Destruction of Salmonella Enteriditis inoculated onto raw almonds by high hydrostatic pressure. Food Res Int 2006;39:408–12. https://doi.org/10.1016/j.foodres.2005.09.003. 4. Tang, J, Feng, H, Lau, M. Microwave heating in food processing. In: Yang, XH, Tang, J, editors Advances in bioprocessing engineering. New Jersey: World Scientific Publishing Co. Pte. Ltd.; 2002. pp. 1–44. https://doi.org/10.1142/9789812706584_0001. 5. Wang, S, Tiwari, G, Jiao, S, Johnson, JA, Tang, J. Developing postharvest disinfestation treatments for legumes using radio frequency energy. Biosyst Eng 2010;105:341–9. https://doi.org/10.1016/j.biosystemseng.2009.12.003.
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