Mathematical Modeling Non-Stationary Heat Exchange of Object Whole-Body Cryotherapy

This paper discusses the dynamics of measuring the temperature of the integumentary tissues of a whole-body cryotherapy object (WBC). Studies have shown the need to use a protective layer on the lower extremities of the WBC object. Several types of protection were considered depending on the geometry, and the thickness and height of the protective layer varied. The physical processes occurring in cryosauna during cryotherapeutic effects on the human body are investigated. The analysis was performed by simulating the process of unsteady heat transfer through a multi-layer object. Research method. The study was performed by the finite element method. The calculations of heat transfer in a solid body, in a biological tissue with internal heat release and calculation of a turbulent flow were carried out. The modules were combined using the multiphysical interface of the software package. Main results. The created computer model made it possible to describe the dynamics of temperature fields in the skin of an object during the WBC process and after its completion. Frostbite of the lower extremities without a protective layer is shown, and the results of applying the protective layer of the WBC object are shown. Practical significance. The mathematical model allows estimating the influence of WBC parameters on the temperature field of the object under study. The results can be used to optimize the design of cryosaun, as well as to improve the efficiency and safety of the WBC, considering the individual characteristics of patients, as well as to improve the therapeutic properties during a WBC session.