Effect of pulsation parameters on the spatial and temporal variation of flow and heat transfer characteristics in liquid metal cross flow the in-line tube bundle

Jiang, Hantao; Niu, Yafeng; Yang, Peng; Liu, Yingwen

doi:10.1016/j.ijheatmasstransfer.2023.124871

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…The shear stress transport (SST) model [21] was chosen to address the closure of Reynolds stress terms. This turbulence model has demonstrated exceptional performance in simulating external flows around tube banks, as evidenced in references [22,23]. The governing equations of the SST model are formulated as follows:…”

Section: Governing Equations and Data Reductionmentioning

confidence: 99%

Heat Transfer and Flow Resistance in Crossflow over Corrugated Tube Banks

Zhong,

Zhao,

Zhao

et al. 2024

Energies

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The engineering of tubes with surface corrugations is recognized as an effective method for enhancing heat transfer within the tube. Yet the impact of surface corrugation on the flow and heat transfer around the tube’s exterior remains inadequately explored. This study investigates the crossflow and heat transfer characteristics in banks of periodically inward-corrugated tubes using computational fluid dynamics. Numerical simulations were performed for both in-line and staggered tube arrangements, covering Reynolds numbers from 1000 to 10,000. The aim was to examine how various corrugation parameters affect heat transfer and flow dynamics in tube banks configured in both in-line and staggered layouts. The results show that the heat transfer and the pressure drop in crossflow across tube banks are substantially influenced by changes in corrugation parameters. Specifically, in the in-line arrangement, both the Nusselt number and Euler number decrease significantly as the corrugation height increases. In contrast, in the staggered arrangement, the Nusselt number and Euler number exhibit less variation in response to surface corrugation. A comparative analysis of performance criteria suggests that a staggered arrangement is more advantageous for improving thermal–hydraulic efficiency in crossflow through corrugated tube banks.

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Section: Governing Equations and Data Reductionmentioning

confidence: 99%

Heat Transfer and Flow Resistance in Crossflow over Corrugated Tube Banks

Zhong,

Zhao,

Zhao

et al. 2024

Energies

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“…In many technical applications, including chemical processing, power systems, heat pumps, automotive, aerospace, and electronic chip cooling, heat exchanger systems are absolutely essential components [1]. Incompatible heat transfer mechanisms between the heat sources (or pool) and the fluid, decreasing efficiency with time, decreased heat transfer as a result of calcification, pressure loss, and pumping power consumption are common issues with such systems [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of using a ZnO-TiO2/water hybrid nanofluid on heat transfer performance and pressure drop in a flat tube with louvered finned heat exchanger

Elibol,

Gonulacar,

Aktas

et al. 2024

J Therm Anal Calorim

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This study used an experimental setup consisting of a flat tube with a louvered finned crossflow configuration to examine the effects of utilizing a ZnO-TiO2-water hybrid nanofluid on heat transfer rate, heat transfer coefficient, Nusselt number, and pressure drop. The studies were carried out under laminar flow conditions (200 < Re < 800), at four different temperatures (50, 60, 70, 80 °C), four different volume concentrations of nanoparticles (0.025, 0.05, 0.1, 0.2%), and three different volume flow rates (4, 6, 8 LPM). The findings were compared with pure water (0%). The results indicate that using hybrid nanofluid improves the heat transfer performance and increases pressure loss in comparison with pure water. When comparing hybrid nanofluid to pure water, the largest increases in heat transfer rate, heat transfer coefficient, Nusselt number, and pressure drop were 87.8%, 21.7%, 26.4%, and 10%, respectively. In addition, it was found that, up to a specific value (0.05%), increasing the nanoparticle volume concentration enhanced the heat transfer rate, heat transfer coefficient and Nusselt number, but which began to decrease on increasing the concentration past this value. Therefore, it was concluded that nanoparticle volume concentrations greater than 0.05% negatively affect heat transfer under the current operating conditions. The maximum heat transfer rate, heat transfer coefficient, and Nusselt number were obtained under the conditions of an 8 LPM volume flow rate, 80 °C inlet temperature, and 0.05% volume concentration.

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