Comparison of FEM calculated heat transfer coefficient in a minichannel using two approaches: Trefftz base functions and ADINA software

Maciejewska, Beata; Łabędzki, Paweł; Piasecki, Artur; Piasecka, Magdalena

doi:10.1051/epjconf/201714302070

Cited by 6 publications

(5 citation statements)

References 15 publications

(14 reference statements)

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“…The 2D approach using Trefftz functions for solving the inverse problem and the commercial software ADINA were also applied in the computations. The results were discussed in the authors' previous works [19,21,26,27,29]. It allowed to verify the correctness of the 1D approach.…”

Section: Htc Determinationmentioning

confidence: 90%

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: Htc Determinationmentioning

confidence: 90%

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

Piasecka

Strąk

2021

Energies

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“…For the analysis of the experimental data, analytical -numerical methods such as: Trefftz and Piccard methods [16], Trefftz and Beck methods [16,17], in which the calculations were based on the use of Trefftz functions. Furthermore, the commercial ADINA program was applied in numerical calculations to perform advanced mathematical procedures using experimental data [18,19]. Similarly, the results of the CFD and heat transfer calculations for the test section with a group of minichannels performed in Simcenter STAR-CCM + software were presented in [20].…”

Section: Introductionmentioning

confidence: 99%

Conception of minichannel cooling for a PVT heat exchanger

Strąk,

Piasecka

2022

EPJ Web Conf.

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In the paper, a new construction of a compact plate heat exchanger dedicated to PVT cooling was numerically tested. The efficiency of photovoltaic panels decreases as their temperature increases, but cooling improves efficiency. A model counter-current heat exchanger with rectangular minichannels was presented. A heated wall of the heat exchanger was a photovoltaic cell. There were laminar flows of Fluorinert FC-72 and distilled water in the minichannels. FC-72 was heated by the photovoltaic panel. The CAD model of a minichannel heat exchanger was proposed. CFD calculations were performed using Simcenter STAR-CCM+ software. The fluid temperature and velocity profile in the minichannels were determined to finally obtain the values of the heat transfer coefficient. The main parameters taken into consideration in the computations concerned: meshes, physics, and geometry. Finally, local heat transfer coefficients were determined.

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“…Main of authors earlier works concerned steady state studies on flow boiling heat transfer in minigaps of different geometry: in an annular minigap [1,2] and in minichannels of rectangular cross sections [2][3][4][5][6]. It was also noticed that the use of enhanced surfaces often increases the intensification of heat transfer both in flow boiling [2][3][4][5][6] and in pool boiling research [7][8][9]. Maciejewska and Piasecka focused on flow boiling heat transfer under unsteady state conditions in minichannels [10,11].…”

Section: Introductionmentioning

confidence: 99%

Development of a two-dimensional mathematical model of flow boiling heat transfer in micro- and minichannels

Hożejowska

Piasecka

Piasecki³

2022

EPJ Web Conf.

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The paper concerns flow boiling heat transfer in micro- and minichannels. In the mathematical model, the steady state heat transfer process in a single asymmetrically heated minichannel was considered. Calculations with the use of Trefftz functions were based on the data from own experiments. The temperature of the heater and the refrigerant were assumed to satisfy the Laplace equations and the energy equation respectively. The problem was solved by the Trefftz method using two sets of Trefftz functions. The known heater and refrigerant temperature distributions were used to determine the heat transfer coefficient at the heater – refrigerant contact. To verify the proposed mathematical model, data from experiments were applied to calculations. The essential part of the experimental stand was the test section which comprises a minichannel heat sink. The heated element for Fluorinert FC-72 flowing along minichannels was a thin foil. The temperature of its outer side was measured using infrared thermography. Thermocouples and pressure transducers installed at the inlet and outlet of the test section monitored fluid temperature and pressure. Mass flow rate, the current supplied to the heater and the voltage drop were also recorded. The resulting graphs presented thermograms of measured temperature on outer surface of the heater, temperature distributions of fluid temperature and local values of the heat transfer coefficient.

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Comparison of FEM calculated heat transfer coefficient in a minichannel using two approaches: Trefftz base functions and ADINA software

Cited by 6 publications

References 15 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

Conception of minichannel cooling for a PVT heat exchanger

Development of a two-dimensional mathematical model of flow boiling heat transfer in micro- and minichannels

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