Open AccessHeat Exchange of the Cylindrical Liquid Body of a Limited Height with the Environment
Author(s) -
Stanislav Tkachenko,
Olga Vlasenko,
Natalia Rezydent
Publication year - 2021
Publication title -
vestnik nacionalʹnogo tehničeskogo universiteta "hpi". seriâ: ènergetičeskie i teplotehničeskie processy i oborudovanie/vestnik nacionalʹnogo tehničeskogo universiteta "hpi". ènergetičeskie i teplotehničeskie processy i oborudovanie
Language(s) - English
Resource type - Journals
eISSN - 2707-7543
pISSN - 2078-774X
DOI - 10.20998/2078-774x.2021.02.05
Subject(s) - dimensionless quantity , thermodynamics , cylinder , mechanics , thermal , materials science , heat exchanger , internal heating , volume (thermodynamics) , heat spreader , intensity (physics) , chemistry , physics , mathematics , optics , geometry
The experimental investigations of the intensity of the heat exchange between the internal surface of the thin-wall metal cylinder and the studied liquid medium were carried out in conditions of its cooling (heating), i.e. under nonstationary heat exchange conditions. The existence of the regular thermal mode in the liquid medium surrounded by the thin-wall metal cylinder has been established. Local in time heat loss coefficients were derived using appropriate dimensionless equations for the stationary mode conditions of heat-exchange in a large volume. Heat loss coefficients were determined using regular thermal mode methods and computational-&-experimental heat loss coefficients. The changes in the relative values of the heat loss coefficients were analyzed using the method of regular thermal mode and computational-&-experimental heat loss coefficients. The deviations in the values of given coefficients in time are mainly within ± 10 %. Relative values of the heat loss coefficients deviate within ± 40 % using appropriate dimensionless equations for the conditions of the stationary mode of heat exchange in a large volume. This conclusion is natural because the cooling (heating) process is nonstationary.