Lattice Boltzmann simulation of fluid flow and heat transfer in a micro channel with heat sources located on the walls

Javaherdeh, Kourosh; Karimi, Habib; Azarbarzin, Touraj

doi:10.1016/j.spmi.2021.107069

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Since the flow through gaps and joints between building parts could be a potential source for unwanted moisture convection, we looked into different usages of LBM to analyse flow through gaps and cavities [44,45,46,47,48,49,50,51,52,53,54]. Investigations of different Re numbers in constricted and straight channels indicate that the "average flow resistance increases and the heat transfer rate decreases in a constricted channel in comparison to a straight channel" [45].…”

Section: Flow Through Channelsmentioning

confidence: 99%

Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components

Sarkany

Bednar

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Since the Lattice Boltzmann Method (LBM) showed promising ways in describing fluid flow and convective phenomena, this literature review gives an overview of the application of LBM to date in the realm of hygrothermal simulations (HAM). Furthermore, ways to apply LBM to derive the influence of convection on moisture transport in building components are assessed. This is achieved by a literature review which is carried out for specific fields of application of LBM which are intertwined with topics of hygrothermal simulations (Natural convection, Porous media, Flow through channels). The introduction is accompanied by a condensed theoretical overview of the used LBM-scheme in most of the reviewed literature. It could be seen that, in regard to these topics, the majority of simulations is carried out 2-dimensionally using mostly the D2Q9 model with single relaxation times. The reviewed literature shows LBM as a validated tool, solidifying the choice of LBM for our purposes. No coupling of LBM to HAM-simulations to derive the influence of convection on moisture transport could be found. In conclusion, the deduction of parameters like the permeability is identified as a potent subfield for the coupling of LBM and HAM-simulations for further research.

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Section: Flow Through Channelsmentioning

confidence: 99%

Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components

Sarkany

Bednar

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…[3] Common flow patterns include bubble flow, slug flow (also known as Taylor flow), stratified flow, annular flow, etc. At present, there are three main problems in the study of flow patterns [4,5]: (i) the definition of flow pattern is vague: at present, the definition of flow pattern is mostly based on the results of subjective observation, with strong subjective factors; (ii) diversified definitions of flow patterns: the names of flow patterns are diverse, and a set of unified definitions have not been established; (iii) qualitative characteristics of flow pattern: flow pattern can only be judged qualitatively, and there is no quantitative judgment method. Although the definition of flow pattern is subjective, the common flow pattern is recognized.…”

Section: Introductionmentioning

confidence: 99%

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Wang

2023

Front. Phys.

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At present, there are relatively few studies on the slug flow generation mode obtained by exchanging gas-liquid two-phase inlets. In this study, an experimental system combining microfluidic devices and high-speed cameras was used to study the effects of gas-liquid two-phase flow rate, liquid physical parameters, etc., On the characteristic length, generation period and other generation characteristics of slug flow, and dimensionless analysis was conducted to investigate the main factors affecting the characteristic length of gas slug. Results show that 1) when the gas flow rate affects the aeroelastic generation characteristics, the aeroelastic characteristic length increases from 443 μm when the gas flow rate increases changes to 657 μm. The generation period decreases rapidly at first and then the change amplitude slows down. The maximum value of aeroelastic generation frequency is 217 s-1; 2) when studying the effect of different liquid flow rates, increasing the liquid flow rate, the characteristic length of the gas bomb gradually decreases, and the generation period of the gas bomb gradually increases. Aeroelastic characteristic length from 770 μm changes to 378 μm. The range of aeroelastic generation cycle is 4–13.4 ms, and the maximum value of aeroelastic generation frequency is 250 s-1; 3) there is a functional relationship between the ratio of aeroelastic characteristic length to channel size L/d and dimensionless gas-liquid flow ratio Q*, Reynolds number Re, Weber number We: L/d=3.677Q*0.58/Re0.11.

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“…The effects of various material properties on momentum, temperature, and species concentration, as well as values relating to engineering considerations such as the skin friction coefficient, rate of energy transfer, and Sherwood number, were calculated and graphed. We assessed recent attempts on heat transfer development in Newtonian and non-Newtonian fluid models with various physical effects in [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Newtonian Heating Convective Flow by Way of Two Different Surfaces

et al. 2022

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In this paper, we offer a numerical study on heated non-Newtonian fluid with a Newtonian heating effect towards thermally stable stretching surfaces. A comparative analysis for two stretched surfaces, namely, plate and cylinder, is offered. The Casson fluid model is considered to be a non-Newtonian fluid model. By applying the suitable set of transformations, the non-linear coupled PDEs are transformed into non-linear ODEs. It is difficult to obtain the exact solution of such non-linear differential equations; therefore, we used the shooting method along with Runge–Kutta scheme. The influence of pertinent flow variables on velocity and temperature is presented through graphs. Notably from the results, heat generation parameters, Newtonian heating, and magnetic parameters enhanced the temperature profile, whereas Casson fluid and magnetic field parameters reduced the fluid velocity. It is also observed that increases in fluid temperature were more influenced at the cylindrical surface as compared with the flat plate. Moreover, we obtained remarkable results for the heat transfer rate by imposing Newtonian heating conditions at the surface; tables are used to present variations in the skin friction coefficient and Nusselt number at the thermally stable surfaces.

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Lattice Boltzmann simulation of fluid flow and heat transfer in a micro channel with heat sources located on the walls

Cited by 7 publications

References 29 publications

Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components

Hygrothermal simulation and risk evaluation - A literature review and assessment of the applicability of the Lattice Boltzmann Method to derive the influence of convection on moisture behaviour in building components

Study on effect of gas-liquid two phase physical feature on slug flow in microchannels

Numerical Analysis of Newtonian Heating Convective Flow by Way of Two Different Surfaces

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