Heat transfer and critical heat flux at evaporation and boiling in refrigerant mixture films falling down the tube with structured surfaces

Pecherkin, N. I.; Павленко, А. Н.; Volodin, O. A.

doi:10.1016/j.ijheatmasstransfer.2015.06.050

Cited by 34 publications

(13 citation statements)

References 20 publications

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“…In real evaporative devices, the situation, when the wet zones alternate with dry ones, thereby creating periodic thermal and diffusion boundary conditions on the wall, is often. A similar pattern is observed at intense evaporation of liquid in the falling films and at boiling, when the dry spots with an abrupt change in boundary conditions can form on the heat transfer surface [17,18].…”

Section: Introductionsupporting

confidence: 64%

Evaporative cooling of air in an adiabatic channel with partially wetted zones

Терехов

Gorbachev

Khafaji

2016

Thermophys. Aeromech.

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The paper deals with the numerical study of heat and mass transfer in the process of direct evaporation air cooling in the laminar flow of forced convection in a channel between two parallel insulated plates with alternating wet and dry zones along the length. The system of Navier-Stokes equations and equations of energy and steam diffusion are being solved in two-dimensional approximation. At the channel inlet, all thermal gas-dynamic parameters are constant over the cross section, and the channel walls are adiabatic. The studies were carried out with varying number of dry zones (n = 0-16), their relative length (s/l = 0-1) and Reynolds number Re = 50-1000 in the flow of dry air (ϕ 0 = 0) with a constant temperature at the inlet (T 0 = 30 °C). The main attention is paid to optimization analysis of evaporation cell characteristics. It is shown that an increase in the number of alternating steps leads to an increase in the parameters of thermal and humid efficiency. With an increase in Re number and a decrease in the extent of wet areas, the efficiency parameter reduces.

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Section: Introductionsupporting

confidence: 64%

Evaporative cooling of air in an adiabatic channel with partially wetted zones

Терехов

Gorbachev

Khafaji

2016

Thermophys. Aeromech.

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“…2018.21.46854.17449 Пленочные течения являются основой многих технологических процессов, в которых имеет место тепломассоперенос. Они используются в дистилляционных колоннах, градирнях, каталитических реакторах, абсорберах, системах охлаждения и термостабилизации [1][2][3][4][5]. В настоящее время продолжаются активные исследования пленочных течений жидкости и поиск способов интенсификации тепломассообмена.…”

Section: поступило в редакцию 4 июля 2018 гunclassified

Интенсификация Теплообмена В Нагреваемой Пленке Жидкости При Воздействии Внешних Искусственных Возмущений

Чиннов¹,

Шарина²

2018

Письма В Журнал Технической Физики

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Heat transfer in a heated film of distilled water under the action of external artificial perturbations with “the most dangerous wavelength” and variation in the Reynolds number from 300 to 500 has been studied. It has been shown that the action of artificial perturbations with an increase in the heat flux density leads to a change in the rivulet-wave structure of the flow, increase in wave amplitudes, and, finally, heat transfer enhancement.

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“…No literature has been found for the use of surfaces that can be categorised as nanostructured in falling film-boiling conditions. Reduced dryout has been successfully achieved on 3D micro-enhanced and micro-porous tubes tested under falling film-boiling conditions with refrigerants, with plateau regions more insensitive to flow rate changes [16,17,24] and critical dryout at lower film flow rates [16,17,25,26] than for plain tubes. The improved wetting performance has been suggested to be through the ability of microstructured surfaces to better distribute the thin liquid films across the heat transfer surfaces [25] with interconnected internal pores distributing liquid [16] and nucleating bubbles further assisting by sucking liquid through the capillary pores to the nucleation sites [26].…”

Section: Introductionmentioning

confidence: 99%