Flow distribution and heat transfer in minigap and minichannel heat exchangers during flow boiling

Klugmann, Michał; Dąbrowski, Paweł; Mikielewicz, Dariusz

doi:10.1016/j.applthermaleng.2020.116034

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…Figure 2a presents a view of the 1st test section components (the 2nd test section is similarly constructed). The mini-channel is positioned between the glass plate (7) and the heated plate (6), which is made of Haynes-230 alloy. The channel's side walls are formed by Teflon plates (2).…”

Section: Test Sectionsmentioning

confidence: 99%

“…In Reference [6], the experimental investigations of two kinds of model plate heat exchangers, namely a mini-gap exchanger and a mini-channel heat exchanger, were described. A single plate was equipped with a mini-gap of 0.1 m long and 0.2 m wide with a thickness of 0.5 and 1.0 mm or with a set of 50 rectangular mini-channels with a 1 × 1 mm cross-section.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations

Piasecka

Strąk

2021

Energies

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This paper reports the results of heat transfer during refrigerant flow in rectangular mini-channels at stationary conditions. The impacts of selected parameters on boiling are discussed, i.e., thermal and flow parameters, dimensions and orientation of the channels. Four refrigerants (FC-72, HFE-649, HFE-7000 and HFE-7100) were used as the working fluid. Research was carried out on the experimental set-up with the test section with a single rectangular mini-channel of 180 mm long and with a group of five parallel mini-channels, each 32 mm long. The temperature of the mini-channel’s heated wall was measured by infrared thermography. Local values of the heat transfer coefficient at the contact surface between the fluid and the plate were calculated using the 1D mathematical method. The results are presented as the relationship between the heat transfer coefficient and the distance along the mini-channel length and boiling curves. Two-phase flow patterns are shown. Moreover, the results concerning various refrigerants and the use of modified heater surfaces are discussed. The main factors influencing the heat transfer process were: mini-channel inclination to the horizontal pane (the highest heat transfer coefficient at 270° and 0°), using modified heater surfaces (especially electroerosion texturing and vibration-assisted laser No. 2 texturing) and working fluids (FC-72 and HFE-7000).

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Section: Test Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations

Piasecka

Strąk

2021

Energies

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“…However, along with several advantages, there is a certain limitation, which is connected with the need to corrugate heat exchange plates [5,6]. This is necessary to minimize deposits on plate surfaces and to create local flow turbulizations, which increase heat transfer coefficients [7][8][9][10][11]. The intensity of heat transfer directly depends on the geometry of the corrugation on the surface of the plates.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Heat Exchange Plate Geometry by Modeling Physical Processes Using CAD

et al. 2022

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This article presents the possibility of evaluating the efficiency of the heat exchange element with a special stamping plate, which is based on the results of computer simulation. The method is based on a comparative analysis of convective heat transfer models implemented in ANSYS using a k-ε turbulence model. To conduct the study, 3D models of three different types of cavity geometry formed between two heat exchange plates (flat plate, chevron plate, and plate with conical stampings) were built. Simulation was performed by finite element analysis in ANSYS for channels formed by the three types of plates, one of which is a new configuration. The results of hydrodynamic and heat exchange parameters allowed for establishing the efficiency of convective heat exchange for plates of known structures and to compare them with the proposed one. It was found that the plates with conical stamping form the smallest channels through which the fluid moves. The velocity of the coolant is uniform throughout the cross section of the channel and equal to 0.294 m/s; the value of the heat transfer coefficient is the largest of the three models and is 5339 W/(m K), while the pressure drop is 1060 Pa. Taking into account the simulation results, the best heat transfer parameters were shown by the channel formed by plates with conical stamping and the highest pressure drop. To increase the efficiency, indicated by the ratio of heat transfer coefficients to hydraulic resistance, the geometry of the plate with conical stamping was optimized. As a result of optimization, it was found that the optimal geometric parameters of the heat exchange plate with conical stamping were achieved at a 55° inclination angle and 1.5 mm height for the cone. The results of this study can be used in the design of heat exchange elements of new structures with optimal parameters for highly efficient heating of liquid coolants.

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“…The miniaturization of devices that generate large heat fluxes in various industries requires the search for highperformance heat exchangers, including phase change and minigeometries [1,2]. A review of the relevant literature and selected publications covering heat transfer during cooling liquid flow in rectangular minichannels was presented in [3,4].…”

Section: Introductionmentioning

confidence: 99%

Simcenter STAR-CCM+ software for CFD and heat transfer calculations in minichannels

Dadas,

Piasecki,

Piasecka

2022

EPJ Web Conf.

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The paper focuses on CFD modelling and numerical simulation of heat transfer during fluid flow in minichannels. The data from the experiment were adopted into Simcenter Star-CCM+ software. The test section comprised seven or twenty-one parallel minichannels of rectangular cross sections. Each minichannel was 1 mm height. During the experimental series, the temperature measurements of the heated wall were recorded due to an infrared camera. Measurement data was compared with the results obtained from numerical calculations. Fluorinert FC-72 was used as a working fluid in experiments and simulations. An increase in the values of the heat transfer coefficient was observed for the test section with 21 minichannels compared to that with seven minichannels. Numerical simulations helped to identify how the change in the number of minichannels affects the intensification of heat transfer during flow without the timeand cost-consuming experimental tests

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Flow distribution and heat transfer in minigap and minichannel heat exchangers during flow boiling

Cited by 17 publications

References 32 publications

Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations

Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations

Optimization of Heat Exchange Plate Geometry by Modeling Physical Processes Using CAD

Simcenter STAR-CCM+ software for CFD and heat transfer calculations in minichannels

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