Heat and mass transfer during adiabatic fluid boiling in channels of contact exchangers

Туз, Валерій Омелянович; Lebed, N.L.

doi:10.1016/j.applthermaleng.2020.116383

Cited by 4 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the film of liquid flowed mainly due to the forces of gravity as the capillary forces were very small. Work [13] shows that the use of mesh porous structures in heat exchange equipment increases its performance by up to 18 %.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Heat transfer intensity at water boiling on the surface of a capillary structure under sub-atmospheric pressure

Melnyk

Кravets

Lipnitskyi

et al. 2021

EEJET

View full text Add to dashboard Cite

This paper considers the effect of structural parameters and saturation pressure on the intensity of heat transfer from boiling on porous structures made of copper metal fibers. The study involved changing the structural and geometric characteristics of porous samples and saturation pressure. The study regime parameters were chosen based on the conditions of operation of steam chambers, namely the horizontal orientation of the work area, the capillary transport of the heat carrier to the work area. It was determined that reducing saturation pressure from 0.1 MPa to 0.012 MPa leads to a reduction in heat transfer by 15‒20 % depending on the parameters of porous structures. This pattern has been explained in this paper by the increased detachable diameters of steam bubbles that thus overlap part of the capillary structure's vaporization area, which leads to a decrease in the values of the discharged heat flux at the same temperature gradient values. The influence of values of the porosity and diameters of fibers, which the samples of a capillary structure were made from, was ambiguous. The parameter chosen for generalizing the data obtained was an effective diameter of the samples' pores, which is a more general characteristic. The generalization of the experimental data has demonstrated that the efficiency of heat transfer increases with an increase in the effective diameter of pores in the examined range from 20 to 90 µm. Estimation dependences have been built to determine the intensity of heat transfer under sub-atmospheric pressures for metal-fibrous porous structures at a deviation of up to ±30 %. It turned out that the resulting dependences could be used to determine the intensity of heat transfer by the examined powder structures under the sub-atmospheric pressure conditions. Applying these dependences would make it easier to design thermal stabilization systems based on steam chambers.

show abstract

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Heat transfer intensity at water boiling on the surface of a capillary structure under sub-atmospheric pressure

Melnyk

Кravets

Lipnitskyi

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…have explained the theoretical and the experimental study on heat and mass transfer of a porous ceramic tube. 2 Also, Tuz and Lebed 3 have studied the heat and mass transfer during adiabatic fluid boiling in channels of contact exchangers. Very recently, the heat and mass transfer of an evaporative cooler with elliptic tube heat exchangers were experimentally studied by Chien et al 4 Wei et al 5 have developed an experimental and numerical study on heat and mass transfer characteristics in a direct-contact total heat exchanger for flue gas heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

et al. 2022

View full text Add to dashboard Cite

This work investigates heat transfer enhancement for a porous ceramic heat exchanger. The effect of flow-induced vibration of exchanging air flow through porous tube banks has been tested. A numerical model able to assess the vibration effect on heat and mass transfer inside a porous ceramic exchanger has been carefully developed. A three-dimensional unstructured control volume finite element method (CVFEM) is developed to simulate the transport phenomena that arise during convective exchange. In this respect, several numerical tests have been conducted. The time evolution of temperature, liquid saturation, and pressure of the porous domain are analyzed and compared for two cases: with and without vibration. It is found that the vibration highly enhances the heat and mass transfer inside the ceramic exchanger. As a result, the gain of exchanging time to reach the thermal equilibrium between the hot air and the porous domain was 75% for the case of air vibration under sawtooth type at a frequency of f v = 5 Hz and V max = 10 m/s compared to nonvibrating exchange.

show abstract

An Innovative Method for Improving Air Conditioning Systems Using Contact Heat Exchanger

Zhykharieva

Kohut

Bushmanov

et al. 2022

Lecture Notes in Civil Engineering

View full text Add to dashboard Cite

Heat and mass transfer during adiabatic fluid boiling in channels of contact exchangers

Cited by 4 publications

References 32 publications

Heat transfer intensity at water boiling on the surface of a capillary structure under sub-atmospheric pressure

Heat transfer intensity at water boiling on the surface of a capillary structure under sub-atmospheric pressure

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

An Innovative Method for Improving Air Conditioning Systems Using Contact Heat Exchanger

Contact Info

Product

Resources

About