The food industry uses a wide variety of processes which are not well understood. Current modelling and measurement approaches are reviewed, with specific reference to work at Birmingham on Particle tracking (PEPT) ... The food industry uses a wide variety of processes which are not well understood. Current modelling and measurement approaches are reviewed, with specific reference to work at Birmingham on Particle tracking (PEPT) and the potential of temperature time indicators in process validation.展开更多
A self-adaptive precise algorithm in the time domain was employed to solve 2-D nonlinear coupled heat and moisture transfer problems. By expanding variables at a discretized time interval, the variations of variables ...A self-adaptive precise algorithm in the time domain was employed to solve 2-D nonlinear coupled heat and moisture transfer problems. By expanding variables at a discretized time interval, the variations of variables can be described more precisely,and a nonlinear coupled initial and boundary value problem was converted into a series of recurrent linear boundary value problems which are solved by FE technique. In the computation, no additional assumption and the nonlinear iteration are required, and a criterion for self-adaptive computation is proposed to maintain sufficient computing accuracy for the change sizes of time steps. In the numerical comparison, the variations of material properties with temperature, moisture content, and both temperature and moisture content are taken into account, respectively. Satisfactory results have been obtained, indicating that the proposed approach is capable of dealing with complex nonlinear problems.展开更多
基金Work at Birmingham described here was sponsored by a number of companies, including Cadbury and Unilever. PWC wishes to acknowledge financial support from DEFRA through the LINK programme.
文摘 The food industry uses a wide variety of processes which are not well understood. Current modelling and measurement approaches are reviewed, with specific reference to work at Birmingham on Particle tracking (PEPT) and the potential of temperature time indicators in process validation.
基金国家自然科学基金,国家自然科学基金,国家重点基础研究发展计划(973计划),the Key Project Foundation of Education Ministry of PRC,Key Project Foundation of Education Ministry of PRC,教育部留学回国人员科研启动基金,Science Foundation of Liaoning Province
文摘A self-adaptive precise algorithm in the time domain was employed to solve 2-D nonlinear coupled heat and moisture transfer problems. By expanding variables at a discretized time interval, the variations of variables can be described more precisely,and a nonlinear coupled initial and boundary value problem was converted into a series of recurrent linear boundary value problems which are solved by FE technique. In the computation, no additional assumption and the nonlinear iteration are required, and a criterion for self-adaptive computation is proposed to maintain sufficient computing accuracy for the change sizes of time steps. In the numerical comparison, the variations of material properties with temperature, moisture content, and both temperature and moisture content are taken into account, respectively. Satisfactory results have been obtained, indicating that the proposed approach is capable of dealing with complex nonlinear problems.