Development of Products and Packaging for Use in Microwave by M W Lorence, P S Pesheck

Development of Products and Packaging for Use in Microwave by M W Lorence, P S Pesheck

By M W Lorence, P S Pesheck

Improvement of Packaging and items to be used in Microwave Ovens presents a concentrated and accomplished overview for builders within the meals and packaging industries. the 1st part discusses the foundations of microwave heating and ovens. The textual content emphasizes the impression of nutrients dielectric houses and geometry on heating uniformity, taste optimization, and hues of microwave meals. the second one half discusses microwave packaging fabrics and layout with chapters that hide inflexible packaging, susceptors, and protective. additionally mentioned are product improvement, oven protection, and machine modeling of microwave items.

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By far the most effective means to visualize the electromagnetic field patterns inside a microwave cavity is to numerically solve Maxwell equations for space and heated loads in the cavity using high power computer simulation. Among the numerical methods that can be applied to solve electromagnetic problems are finite element method (FEM), finite difference time domain (FDTD) method, and method of moment (MoM). Commercial software such as QuickwaveTM and AnsoftTM are available for this purpose.

1 Food dielectric properties Food materials are in general not good electric insulators nor good electric conductors, thus fall into the category of lossy dielectric materials. When exposed to an alternating electric field, foods can partially store electric energy as a capacitor and partially convert electric energy into heat, like a resistor. These characters are determined by the complex relative permittivity (relative to free space or air): 4 ˆ 4H À j4HH ˆ j4jeÀj 1X82 where 4 ˆ the complex relative dielectric constant, 4H ˆ the relative dielectric constant, 4HH ˆ the relative pdielectric loss factor,  ˆ dielectric loss angle (tan  ˆ 4HH a4H ), and j ˆ À1.

Whey protein gels or mashed potato), to study heating patterns in microwave systems designed for high temperature processing of packaged foods. By far the most effective means to visualize the electromagnetic field patterns inside a microwave cavity is to numerically solve Maxwell equations for space and heated loads in the cavity using high power computer simulation. Among the numerical methods that can be applied to solve electromagnetic problems are finite element method (FEM), finite difference time domain (FDTD) method, and method of moment (MoM).

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