Numerical study of air-side performance of a finned flat tube heat exchanger with crossed discrete double inclined ribs

Song, Weiming; Jiang, Meng; Li, Z.X.

doi:10.1016/j.applthermaleng.2010.04.013

Cited by 15 publications

(4 citation statements)

References 44 publications

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“…Wang et al [24] investigated the effects of parameters such as Re, rib height (e), and number of ribs (n). In other studies of DDIR, Zheng [25], Ariwibowo [26], Song [27], and Zhang [28] all indicated that DDIR has a better/superior heat transfer performance. The above studies on DDIR were all conducted under subcritical conditions, whilst Yuan et al [29] were the first to apply DDIR to supercritical conditions.…”

Section: Introductionmentioning

confidence: 86%

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Yang,

Tang,

2024

Energies

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This work numerically studied the heat transfer and flow characteristics of supercritical R134a in horizontal pipes equipped with DDIR, considering variations in the rotation angle of DDIR. The aim is to improve the effects of the DDIR configuration on the heat transfer of supercritical flow. After validation with experimental data, the AKN model was employed to examine the effects of four sets of rotation angles (0°, 30°, 45°, and 60°) on the axial and circumferential heat transfer characteristics of DDIR horizontal tubes under the influence of strong (q1/G1 = 0.1 kJ/kg) and medium (q2/G2 = 0.056 kJ/kg) buoyancy. Results show that variations in the rotation angle do not induce significant alterations in the flow field, thus exerting minimal influence on the axial heat transfer characteristics. Meanwhile, the rotation angle determines the relative positioning of the circumferential inner wall temperatures and heat flux distribution, although the magnitude of this effect remains inconspicuous. The rotational angle parameter can be reasonably neglected in the future design and installation of heat exchangers.

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Section: Introductionmentioning

confidence: 86%

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Yang,

Tang,

2024

Energies

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“…Dimples [23] Grooves [24] Ribs [25] Applying turbulators can interrupt the laminar (viscous) sublayer, which decreases thermal resistance and promotes turbulence in a region near to artificially roughened surface and hence can provide better heat transfer. in the heat transfer and 10% decrease in the friction factor as compared to circular tubes.…”

Section: Flow Manipulatorsmentioning

confidence: 99%

Development of new finned tube heat exchanger: Innovative tube-bank design and thermohydraulic performance

Lotfi

Sundén

2019

Heat Transfer Engineering

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Three-dimensional numerical simulations are successfully carried out on thermo-hydraulic characteristics of a new plain fin-and-elliptical tube (PFET) heat exchanger with innovative types of tube-banks, namely-a slotted elliptical tube-bank (SETB) (Case B and Case C) and a slotted annular elliptical tube-bank (SAETB) (Case D and Case E). The new PFET heat exchanger contains elliptical cross-sectioned tubes that create narrow slots oriented in the streamwise or/and spanwise direction. The investigation on the effects of different shape tube-banks on the air-side heat transfer and fluid flow characteristics in the new PFET heat exchanger was performed using the ANSYS CFXV R package. The objectives of this investigation are to determine an optimal staggered tube-bank configuration for augmenting heat transfer rates with minimal pressure drop penalties, and compare the results against traditional non-slotted elliptical tube-bank heat exchangers. The averaged heat transfer rate of the SETB/SAETB heat exchanger is more than 15% greater than that of the traditional nonslotted elliptical tube heat exchanger. The overall performance evaluation criteria, estimated in terms of the area goodness factor and volume goodness factor for enhanced cases (SETBs/ SAETBs), were higher than there found by a non-slotted elliptical tube-bank case. Overall, the computational results showed that the Case D causes an appreciable increase of the heat transfer rate without a pressure drop penalty.

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“…J. Ou and L. Li: Multi-field coupling enhanced heat transfer principle and its application On one hand, improving the engine compartment structure for the purpose of enhancing its convective heat transfer, such as analysing the velocity and temperature fields in the cabin (Merati et al, 2011), improving the front-end structure of the car (Singh and Shen, 2007;Juan, 2008;Lukeman et al, 2012;Harambat, 2014;Khaled et al, 2014a) adjusting the spatial layout of the internal parts of the engine compartment (Khaled et al, 2014b), or adding wind deflectors (Khaled et al, 2010;Wei et al, 2006). On the other hand, the optimization of engine cooling systems, such as intelligent control of the cooling system (Kaleli et al, 2018;Sun et al, 2017;Lu et al, 2019) and optimization of design parameters of the engine cooling module (Khaled et al, 2012;Sharma et al, 2018;Lu et al, 2016;Baskar and Rajaraman, 2018).…”

Section: Introductionmentioning

confidence: 99%

Application of the multi-field coupling enhanced heat transfer principle to the engine compartment design of clean gas bus

2020

Mech. Sci.

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Abstract. Clean gas engines, such as liquefied petroleum gas (LPG) engines, have high thermal loads on parts under equivalent specific combustion. This study examines the multi-field coupling enhanced heat transfer principle and its applications to the engine compartment of a typical LPG city bus. The field synergy enhanced heat transfer principle (FSP) was applied in the radiator assembly area. The FSP model yielded an optimum velocity -temperature gradient matching field that would improve convective heat transfer in this area. To strengthen the convective heat transfer ability of the limited cooling air in the cabin, temperature field homogenization (TFH) in the core flow region of the engine block area was achieved. The TFH optimization model helped minimize the temperature gradient in the core flow region and maximize it at the heat transfer boundary, and the optimum vector field and flow path were obtained. More comprehensive changes to the structural design were made according to the multi-field coupling enhanced heat transfer principles. The simulation results showed that in the comprehensive structure, the heat transfer efficiency of the radiator increased by 14.66 %, the average temperature of the air passages in the engine block area decreased by 22.23 %, and the heat dissipation coefficient of the engine body and engine cover increased by 4.60 times and 3.49 times, respectively.

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Numerical study of air-side performance of a finned flat tube heat exchanger with crossed discrete double inclined ribs

Cited by 15 publications

References 44 publications

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Development of new finned tube heat exchanger: Innovative tube-bank design and thermohydraulic performance

Application of the multi-field coupling enhanced heat transfer principle to the engine compartment design of clean gas bus

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