Laminar heat transfer performance of power law fluids in coiled square tube with various configurations

Kurnia, Jundika C.; Sasmito, Agus P.; Mujumdar, Arun S.

doi:10.1016/j.icheatmasstransfer.2014.07.016

Cited by 26 publications

(13 citation statements)

References 26 publications

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“…The mathematical model together with constitutive relations and appropriate boundary conditions are then solved by using finite volume solver ANSYS Fluent. A mesh independence test was conducted to ensure mesh independent results [20][21][22][23][24][25][26][27][28][29][30][31]. On average, mesh amounts ranging from 210 5 to 510 5 are required to model the computational domain [20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Numerical Methodologymentioning

confidence: 99%

“…where m  is mass flow rate and Tmean,L and Tmean,0 are the mixed mean temperature at length L and at the channel inlet, respectively. Pumping power, Ppump, is given by [ [25][26][27]…”

Section: Constitutive Relationsmentioning

confidence: 99%

“…The results indicated that flow characteristic and heat transfer are strongly influenced by the placement of longitudinal rib where a single rib arrangement shows superior performance compared to other configurations. Driven by the fact that studies on heat transfer performance of a non-circular coiled tube is scarce, our group have conducted and reported a series of computational studies [20][21][22][23][24][25][26][27][28][29][30][31] investigating the heat transfer performance of non-circular coiled tubes. Various coil geometries and cross-sections are evaluated to assess the heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

Kurnia¹,

Sasmito²

2022

Int. J. Automot. Mech. Eng.

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Coiled tubes have been widely used in major industries due to their high heat transfer, ease of manufacturing and compactness. Numerous studies have been conducted experimentally and numerically to evaluate the heat transfer performance of coiled tubes. A majority of these studies were focused on circular tubes, while only limited studies were concerned on non-circular tubes. Recently, a series of computational studies have been conducted in our research group to investigate the flow characteristic and heat transfer performance of non-circular coiled tubes. Several key parameters affecting flow behavior and heat transfer performance have been evaluated and examined. The heat transfer performance is numerically evaluated and compared by utilizing the concept of Figure of Merit (FoM). The paper is intended to provide an essential summary of these numerical studies with the aim of providing a general overview of the advantage and drawbacks of non-circular coiled tubes in thermal engineering applications. Challenges and directions of the research will also be discussed. In general, it is revealed that heat transfer improvement in the coiled tube is followed by increasing pumping power. Moreover, with a more complex coiled geometry proposed, the processes of manufacturing the tube and creating the computational domain will become major issues in non-circular coiled tube studies. In addition, more studies on the application of coiled tubes used for heat exchanger and chemical reactor are expected to increase in the future, especially in the micro or nanoscale.

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Section: Numerical Methodologymentioning

confidence: 99%

“…where m  is mass flow rate and Tmean,L and Tmean,0 are the mixed mean temperature at length L and at the channel inlet, respectively. Pumping power, Ppump, is given by [ [25][26][27]…”

Section: Constitutive Relationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

Kurnia¹,

Sasmito²

2022

Int. J. Automot. Mech. Eng.

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“…Because it needs more pumping power to compensate pressure drop. Jondicka [15] investigated on the heat transfer performance of non-Newtonian laminar fluid flow through spiral tubes considering the different modes. The aqueous solution of carboxy-metal-cellulose (CMC) is used as non-Newtonian fluid for study.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Numerical Study on Nanofluid Flow and Heat Transfer of Helical, Spiral and Straight Tubes with Different Cross Sections

Abdi¹,

Asaadi²,

Kivi³

et al. 2019

IJHT

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A numerical comparative analysis is carried out on heat transfer performance of laminar fluid flow of water/Al2O3 nanofluid in straight, spiral and helical tubes with various cross sections. Circular, triangular, rectangular and square cross-section in an identical length are considered as geometrical variables. Nanoparticles of Al2O3 added into the water (as base fluid) with volume fractions of 0.1-0.7 and it was flowed through different types of tubes, for different Reynolds number. Governing equations on fluid flow were solved based on finite element method. Results show, adding nanoparticles improves heat transfer as well as pressure drop. Among all types of tubes, helical-shaped tube has higher amount of heat transfer and pressure drop compared to spiral and straight. In a specific geometry at constant volume fraction and Re, highest heat transfer and pressure drop is related to the tube with rectangular cross-section. In all volume fractions and sections, average heat transfer coefficient in helical tube is higher than spiral and straight. Although helical tube has better heat transfer performance compared to spiral and straight, pressure drop between outlet and inlet in helical is higher than spiral and straight tubes. As a result, amount of FOM, the ratio of heat transfer to pressure drop, for helical geometry is lower than spiral and straight.

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“…Among the first studies on coiled/curved tubes was conducted by Dean who observed secondary flow development in a circular toroidal tube when the ratio of the viscous force acting on a fluid flowing in a curved pipe to the centrifugal force (defined as Dean number, De) exceeds the critical value [1,2]. Kurnia et al conducted a series of computational evaluation of heat transfer performance in coiled tubes and compared with those of straight tubes [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Performance of Various Coiled Square Tubes for Heat Exchanger Application

et al. 2015

Self Cite

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In heat exchanger application, working fluid inside the tubes is subjected to considerable temperature changes. In order to improve heat transfer performance, various strategies are proposed and evaluated; one of them is the application of coiled tubes. Coiled tubes have been used widely in heat exchanger application mainly due to the presence of secondary flow which enhances heat transfer considerably. This study addresses heat transfer performance of three configurations of coiled tubes with square crosssection, i.e. in-plane, helical and conical coiled tubes, subjected to large temperature difference. Their heat transfer performance is numerically evaluated and compared with that of a straight tube with identical cross-section and length. A concept of Figure of Merit (FoM) is introduced and utilized to fairly asses the heat transfer performance of the coiled tube configurations. The results indicate that FoM increase as the wall temperature increase. In addition, combination of temperature-induced buoyancy flow and curvature-induced secondary flow considerably affect the flow behavior and heat transfer performance inside the tubes.

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Laminar heat transfer performance of power law fluids in coiled square tube with various configurations

Cited by 26 publications

References 26 publications

Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

Heat transfer performance of non-circular coiled tubes - Research summary, challenges and directions

A Comprehensive Numerical Study on Nanofluid Flow and Heat Transfer of Helical, Spiral and Straight Tubes with Different Cross Sections

Numerical Investigation of Heat Transfer Performance of Various Coiled Square Tubes for Heat Exchanger Application

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