The calculation of the relaxation processes during dehydration of fish

The methods of study of relaxation processes that are applicable during fish dehydration considering the influence of the chemical composition, geometric size of the processing object and regime parameters of the dehydration processes are developed in this work. The usage of the numerical methods of calculation on the basis of solution of the second-order differential equation with boundary conditions of the third kind allow with sufficient accuracy for engineering practice modeling the different conditions of the dehydration process conducting with periodic restoration of hydraulic conductivity properties of the objects of dehydration. The proposed calculation methods applicable to dehydration processes. Which consists of a continuous initial period and the combined periods of drying fish and relaxation dehydration facility. During the relaxation is provided an exposure to a drying agent for dewatering for a certain time. During relaxation stops the supply of electric power to the heating elements. Reduces the rate of circulation of the drying agent. In the drying installation is supplied with air of lower temperature and higher relative humidity than the drying agent. In drier conditions are created that constrain external mass transfer and promotes relaxation of moisture, that is, to its redistribution in the thickness of the fish. During the relaxation of the moisture is gradually shifting from the central layers where dehydration has not yet come to the dehydrated surface layers. The appearance of moisture inside the dehydrated surface area leads to putting up and expansion of capillaries. At the next interval change product moisture re-enters the dehydration process, the high conductive properties throughout its volume.