Методика розрахунку теплообміну для неізотермічних поверхонь в умовах ламінарної струминної пристінної течії

Authors

  • В. Г. Горобець

Abstract

UDC 536.24

METHOD OF CALCULATION OF HEAT TRANSFER FOR NONISOTHERMAL SURFACES UNDER LAMINAR JET FLOW

V. Gorobets

 

Wall flows can to have a wide use in the power systems applied in industry and agrocultural complex. To such systems is belong the convective dryers in which there is drying of foods of agricultural production by a way of accumulation of heated air streams on foods of drying behave, for example. In other cases streams are used for treatment of the ground surfaces with the purpose of disinfection, for cooling of polymeric tapes, for drying fabrics at painting, at creation of thermal curtains, and others like that.

The existent calculable methods of heat transfer for wall flows are based on the use of empiric dependences and does not take into account such factor, as the influence on heat emission of nonisothermal surface of flowing around in the conditions of laminar modes of flow. The indicated factor can substantially influence on quantitative and quality conformities to law heat transfer for these terms.

Aim of researches. To work out methodology of calculation of heat transfer on an nonisothermal surface in the conditions of wall stream using integral methods of decision of equalizations of transfer.

Methodology of calculation of heat transfer is worked out for the terms of wall stream flows at flowing around of nonisothermal bodies in the conditions of the laminar mode of flow.

Using the integral methods of decision of equalizations of frontier layer general functional dependence is got between the closeness of the thermal stream taken from a surface and temperature gradient on an nonisothermal surface.

Numeral calculations are conducted and numeral values of parameters of heat transfer depending on thermophysical properties of external heat carriers are found.

References

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Кэйс В.М. Конвективный тепло- и массоперенос./ В.М. Кэйс – М.: Энергия. 1972. – 446 с.

Дорфман А.Ш. Теплообмен при обтекании неизотермических тел / А.Ш. Дорфман – М.: Машиностроение. 1982. – 191 c.

Майерс Г.Е. Теплообмен в плоских турбулентных струях у стенки / Г.Е. Майерс, ?.?. Шауэр, Р.Х. Юстис // Теплопередача. – 1963, т.80. №3 – С. 35-40.

Вулис Л.А. Теория струй вязкой жидкости / Л.А Вулис, В.П. Кашкаров – М. – Наука, 1965. – 432 c.

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Published

2017-03-21

Issue

No. 3 (2016)

Section

Статті

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