Research and applications of drag reduction in thermal equipment: A review

Gong, Wenchi; Shen, Jun; Dai, Wei; Li, Ke; Gong, Maoqiong

doi:10.1016/j.ijheatmasstransfer.2021.121152

Cited by 23 publications

(3 citation statements)

References 110 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some researchers also believe that increasing or decreasing heat transfer 38–41 at hydrophobic surfaces depends on factors such as channel structural characteristics, cooling fluid thermal features, and channel material. 42 The features of nanofluids were explored numerically by Heidarian et al 43 in a microchannel heat sink regarding heat transference and pressure drop with hydrophilic, hydrophobic, and superhydrophobic surfaces. The single-phase approach was used for water-Al 2 O 3 nanofluid simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer and pressure drop of nanofluids in a combined porous media of hydrophobic and hydrophilic surfaces

Babaei

Aminian

Saffari

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The present study provides a 3D numerical research on the hydro-thermal performance of water-Al2O3/CuO nanofluids and water/Al2O3-CuO hybrid nanofluid inside a U-bend tube incorporating a porous medium with both hydrophilic and hydrophobic surfaces. Furthermore, a single-phase flow is adopted to simulate the nanofluid flow. Taking into consideration the equation of the Darcy-Brinkman-Forchheimer, to simulate the flow of fluids in the porous media. The influence of Dean number on hydro-thermal performance in the range of (600–1750) was investigated. And according to the results, Dn = 600 had the best performance. Considering the outcomes, a completely hydrophobic wall has a better hydro-thermal performance than a completely hydrophilic one and other hydrophilicity and hydrophobicity combinations. As well, improvement in heat transfer efficiency is considerably influenced by the Darcy number (10−4–10−1) and the augmentation of the porous thickness ratio. Additionally, average Nusselt number and pressure losses for any and all types of nanofluids show an incremental schema with augmenting volume fraction, while PEC exhibits a reducing pattern. Besides this, structures with permeable porous media or ones with Da = 0.1 and rp = 0.6 present the highest PEC. Also, among the reviewed nanoparticles, Al2O3 with a volume percentage of 1% had the maximum PEC.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer and pressure drop of nanofluids in a combined porous media of hydrophobic and hydrophilic surfaces

Babaei

Aminian

Saffari

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…In previous studies, superhydrophobic surfaces (SHS) have been used to reduce friction while maintaining the benefits of reduced system size (see the review by Gong et al. 2021). Similar effects could be accomplished with a LIS.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer increase by convection in liquid-infused surfaces for laminar and turbulent flows

Sundin

Ciri²,

Leonardi³

et al. 2022

J. Fluid Mech.

View full text Add to dashboard Cite

Liquid-infused surfaces can reduce friction drag in both laminar and turbulent flows. However, the heat transfer properties of such multi-phase surfaces have still not been investigated to a large extent. We use numerical simulations to study conjugate heat transfer of liquid-filled grooves. It is shown that heat transfer can increase for both laminar and turbulent liquid flows due to recirculation in the surface texture. Laminar flow simulations show that for the increase to be substantial, the thermal conductivity of the solid must be similar to the thermal conductivity of the fluids, and the recirculation in the grooves must be sufficiently strong (Péclet number larger than 1). The ratio of the surface cavity to the system height is an upper limit of the direct contribution from the recirculation. While this ratio can be significant for laminar flows in microchannels, it is limited for turbulent flows, where the system scale (e.g. channel height) usually is much larger than the texture height. However, heat transfer enhancement of the order of $10\,\%$ is observed (with a net drag reduction) in a turbulent channel flow at a friction Reynolds number ${{Re}}_\tau \approx 180$ . It is shown that the turbulent convection in the bulk can be enhanced indirectly from the recirculation in the grooves.

show abstract

“…The current methods of fluid drag reduction mainly include microbubble, 5 polymer additive, 6 superhydrophobic 7 and bionic structure 8 methods. Injecting airflow into the ship surface to form a layer of bubbles can reduce the frictional resistance.…”

Section: Introductionmentioning

confidence: 99%