Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

Sikora, Małgorzata

doi:10.3390/ma14226889

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…It is similar to the influence of structures on flow resistance. The dispersion structure gives higher flow resistance than the stratified and intermittent structures [25].…”

Section: Modelling Of the Condensation Process In Pipe Mini-channelsmentioning

confidence: 95%

“…The results of thermal tests are compared here with the results of observations of the condensation process in mini-channels. The authors published the results of flow structure and thermal studies during condensation of HFE7000, HFE7100 and Novec649 refrigerants in mini-channels [25][26][27]. Based on these studies, the mathematical model presented later in the article was created.…”

Section: 144mentioning

confidence: 99%

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Modelling the Condensation Process of Low-Pressure Refrigerants in Mini-Channels

Sikora

Bohdal

2022

Materials

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The measure of the energy efficiency of the non-adiabatic two-phase condensation process of refrigerants in mini-channels is both the value of the heat transfer coefficient α and the flow resistance expressing the external energy input required to realize the flow. The modelling of this very complex process is effective if the condensation mechanism in mini-channels is correctly identified. It has been proven that the effects of changes in the condensation mechanism are the different structures of the two-phase flow resulting from process interactions both in the channel cross-section and along the flow path. The research aimed to connect the value of the heat transfer coefficient with the flow structures occurring during condensation. Thermal and visualization studies of the condensation process of low-pressure refrigerants were carried out: Novec649, HFE7100 and HFE7000 in tubular mini-channels with diameters dh = 0.5; 0.8; 1.2; 2.0 mm. Based on visualization studies, flow structures were proposed to be divided into 3 main groups: dispersive, stratified and intermittent. Based on this, a computational correlation was derived for determining the heat transfer coefficient and frictional resistance depending on the type of flow structure. The research shows that the highest values of the heat transfer coefficient occur during the mist flow and the lowest during the bubble flow.

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“…It is similar to the influence of structures on flow resistance. The dispersion structure gives higher flow resistance than the stratified and intermittent structures [25].…”

Section: Modelling Of the Condensation Process In Pipe Mini-channelsmentioning

confidence: 95%

Section: 144mentioning

confidence: 99%

Modelling the Condensation Process of Low-Pressure Refrigerants in Mini-Channels

Sikora

Bohdal

2022

Materials

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“…Factors influencing the surface condition are roughness [8] and fouling [9]. Another issue is the type of heat transfer fluid: gas or liquid, single-phase or two-phase fluid flow [10][11][12][13][14]. Single phase heat transfer processes in micro-and mini-channels with the use of various material properties of working fluids were studied in [10,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Single phase heat transfer processes in micro-and mini-channels with the use of various material properties of working fluids were studied in [10,13,14]. In turn, the works [11,12] present the results of the research of new refrigerants condensation in mini-channels.…”

Section: Introductionmentioning

confidence: 99%

Mass/Heat Transfer Analogy Method in the Research on Convective Fluid Flow through a System of Long Square Mini-Channels

2022

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The paper presents the results of experimental investigations of mass transfer processes with the use of the limiting current technique. This experimental work analyzed the not fully developed entrance laminar region. The tested case refers to the convective fluid flow through a system of nine long, square mini-channels that are 2 mm wide and 100 mm long. The method used in the measurements allows one to determine mass transfer coefficients during the electrolyte flow by utilizing electrochemical processes. The received mass transfer coefficients were applied to the analogous heat transfer case. The Chilton–Colburn analogy between mass and heat transfer was applied. The obtained results, in the form of the dependence of Nusselt number within the function of Reynolds and Prandtl numbers, can be a useful formula in the design and analysis of heat transfer processes in mini heat exchangers.

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Comprehensive analysis of two-phase liquid-gas flow structures in varied channel geometries and thermal environments

Sikora,

Anweiler,

Meyer

2024

International Journal of Heat and Mass Transfer

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Flow Structure Investigations during Novec Refrigerant Condensation in Minichannels

Cited by 5 publications

References 39 publications

Modelling the Condensation Process of Low-Pressure Refrigerants in Mini-Channels

Modelling the Condensation Process of Low-Pressure Refrigerants in Mini-Channels

Mass/Heat Transfer Analogy Method in the Research on Convective Fluid Flow through a System of Long Square Mini-Channels

Comprehensive analysis of two-phase liquid-gas flow structures in varied channel geometries and thermal environments

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