Determination of the temperature distribution in a minichannel using ANSYS CFX and a procedure based on the Trefftz functions

Maciejewska, Beata; Błasiak, Sławomir; Piasecka, Magdalena

doi:10.1051/epjconf/201714302071

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…The authors of this work continue their experimental and theoretical investigations, testing the application of analytical [2], semi-analytical-numerical methods with the application of the Trefftz functions [21][22][23][24] and several commercial numerical programs: Simcenter STAR-CCM+ [14], ADINA [25,26] and ANSYS CFX [27] programs to perform heat transfer calculations during fluid flow in mini-channels.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements

Piasecka

Maciejewska

Piasecki³

2023

Energies

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The main aim of this work was to provide heat transfer calculations of flow boiling in mini-channels with an application for the Trefftz functions. The test section comprised five parallel mini-channels with a depth of 1 mm, with a common heated wall. For the estimation of the temperature uncertainty, during the experiment the temperature measurement was performed with the use of K-type thermoelements and an infrared camera in two mini-channels simultaneously. According to the Guide to the Expression of Uncertainty in Measurement, the Monte Carlo method is a practical alternative to the GUM uncertainty framework. Since the uncertainty components are not approximately the same magnitude, the Monte Carlo method was indicated to estimate the uncertainty of the surface temperature measurement. The results obtained from this simulation method were compared with the results of the computation related to the uncertainty propagation method. The results of both methods of temperature measurement were found to be consistent. The results of the statistical analysis were used to describe heat transfer calculations. The heat transfer investigations concerning the subcooled boiling region were performed during the other experiment. The local heat transfer coefficients on the contact surface between the working fluid and the heated wall were calculated from the Robin boundary condition. The mathematical model described by the heat equation in the mini-channel wall and by the Fourier-Kirchhoff equation in a flowing fluid leads to an inverse heat transfer problem. This problem was solved using the FEM with the Trefftz-type basis functions. The estimation of temperature uncertainty measurements due to the Monte Carlo method was included in the final results of the heat transfer coefficient.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements

Piasecka

Maciejewska

Piasecki³

2023

Energies

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“…Modifications to the configuration of the inlet manifold channel and plenum were carried out to improve the fluid distribution. The first attempts at numerical calculations according to the mathematical model describing heat transfer during fluid laminar flow in minichannels using ANSYS CFX program and ADINA software, and the computations based on the finite element method and the Trefftz functions were performed by the authors of this work and shown in [29,30], respectively. The outcomes of the comparative analysis were discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the experimental data, analytical and analytical-numerical methods using the Trefftz functions, the heat transfer coefficient values on the heating surface contacting the fluid flowing in a minichannel were determined. Only the first attempts have been made to predict the behavior of cooling fluids flowing in minichannels due to numerical calculations using ANSYS CFX [30] and ADINA software [29].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

2020

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This work focuses on subcooled boiling heat transfer during flow in a minichannel heat sink with three or five minichannels of 1 mm depth. The heated element for FC-72 flowing along the minichannels was a thin foil of which temperature on the outer surface was measured due to the infrared thermography. The test section was oriented vertically or horizontally. A steady state heat transfer process and a laminar, incompressible flow of the fluid in a central minichannel were assumed. The heat transfer problem was described by the energy equations with an appropriate system of boundary conditions. Several mathematical methods were applied to solve the heat transfer problem with the Robin condition to determine the local heat transfer coefficients at the fluid/heated foil interface. Besides the 1D approach as a simple analytical method, a more sophisticated 2D approach was proposed with solutions by the Trefftz functions and ADINA software. Finite element method (FEM) calculations were conducted to find the temperature field in the flowing fluid and in the heated wall. The results were illustrated by graphs of local heated foil temperature and transfer coefficients as a function of the distance from the minichannel inlet. Temperature distributions in the heater and the fluid obtained from the FEM computations carried out by ADINA software were also shown. Similar values of the heat transfer coefficient were obtained in both the FEM calculations and the 1D approach. Example boiling curves indicating nucleation hysteresis are shown and discussed.

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“…The heat transfer issues can be modelled by numerically method using specialized software such as ANSYS CFX and Fluent like in [19,20].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the 1D and 2D calculation models used for determination of the heat transfer coefficient during flow boiling heat transfer in a minichannel

2019

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The paper discusses the results of the flow boiling heat transfer in a vertical minichannel with rectangular cross-section. The heating element for FC-72 flowing in the minichannel is a thin plate. Infrared thermography is used to determine changes in the temperature on its outer side. The aim of the calculation is to determine the heat transfer coefficient using 1D and 2D calculation models. Local values of heat transfer coefficient on the surface between the heated plate and boiling fluid are calculated from the Newton`s and Fourier`s laws. In 2D model the plate temperature distribution is obtained by solving the inverse heat conduction problem. The governing equation is solved by means of two methods: the non-continuous Trefftz method and the Beck method. The results are presented as plate temperature and heat transfer coefficient calculated using 1D and 2D models as a function of the distance from the minichannel inlet. The analysis of the results revealed that the values and distributions of the heat transfer coefficient calculated by means of both models were similar. This suggests that all mentioned methods are interchangeable.

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Determination of the temperature distribution in a minichannel using ANSYS CFX and a procedure based on the Trefftz functions

Cited by 5 publications

References 15 publications

Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements

Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements

Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software

Comparison of the 1D and 2D calculation models used for determination of the heat transfer coefficient during flow boiling heat transfer in a minichannel

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