Flow and heat transfer enhancement in tube heat exchangers

Ahmed, Saeed; Mesalhy, Osama; Abdelatief, Mohamed A.

doi:10.1007/s00231-015-1669-1

Cited by 64 publications

(13 citation statements)

References 99 publications

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“…Improving heat transfer in thermal devices like heat exchangers has become a vital point of focus in the industry. Several studies [1][2][3][4] have been carried out to optimize the size, layout, and shape of devices to improve the heat-transfer characteristics. Another way to enhance heat transfer is to use a porous material, which may be crucial in thermal management applications due to its high surface-area-to-volume ratio, low relative density, and high fluid permeability.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Strength and Microstructural Evolution of Porous Cu/Cu Brazed Joints Using Cu-Ni-Sn-P Filler

Sami

Zaharinie

Yusof

et al. 2020

Metals

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Porous Copper (Cu) was brazed to Cu plates using Cu-9.7Sn-5.7Ni-7P amorphous filler metal. The effects of brazing parameters on the porous Cu and brazed joints were investigated. The furnace brazing temperatures employed were 660 °C and 680 °C, and the holding times were 10 and 15 min. After brazing, the microstructure was analyzed using Scanning Electron Microscope (SEM) equipped with Electron Dispersive X-ray Spectroscope (EDS). SEM results showed that the thickness of the brazed seam at the base joint decreased with increasing temperature and time. At low brazing temperature, microvoids and cracks were observed at the joint interface. The microvoids and cracks disappeared in the sample brazed at 680 °C for 15 min, and higher diffusion of the filler was noted in the overall bonded region. The formation of Cu-P, Cu-Ni, and Ni-Sn phases at the joint interface was validated using X-ray diffraction. The phases formed increased the hardness of the brazed joints and porous Copper. It was observed that the rigidity of porous Copper tends to increase due to surface hardening effects. The rigidity of porous Cu after brazing is important in ensuring minimal deformation during cooling device servicing, which is an integral feature of prospect product development.

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Section: Introductionmentioning

confidence: 99%

Investigation on Strength and Microstructural Evolution of Porous Cu/Cu Brazed Joints Using Cu-Ni-Sn-P Filler

Sami

Zaharinie

Yusof

et al. 2020

Metals

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“…Because the radiating fin is very thin and large in size, dividing the solid model of the radiator into grids would generate numerous grids and costs a lot of computing resources and time. To reduce computational load, the fin structure at the core is simplified to an area of porous medium during the simulation of airside heat transfer of the radiator [15,16,17].…”

Section: Simplification and Establishment Of Geometric Modelmentioning

confidence: 99%

Influence of radiating tube type on heat dissipation of assembled radiators

Ying¹,

Chen²,

Li³

et al. 2017

IJHT

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The fabrication of assembled radiator features high production efficiency and causes no pollution to the environment thanks to the application of mechanical processing. Nevertheless, the application range of assembled radiator is greatly limited due to the low thermal efficiency. In the environment-friendly modern society, researchers are racking their brains to answer the difficult question of how to improve the thermal efficiency of assembled radiator to the level of brazed radiator. Against this backdrop, this paper compares the heat dissipation performance of flat tube type and wasp-waisted tube type automobile radiators through simulation and experiment, and discovers that wasp-waisted tube type assembled radiator has higher heat transfer capacity. It is proved in this research that the heat dissipation performance of assembled radiator can be improved by optimizing the shape of radiating tube, especially minimizing equivalent diameter and expanding the circulation area in the tube. Suffice it to say that this research provides valuable references for future study on the heat dissipation performance of assembled radiator.

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“…The main subject to design radiator is how to enhance the heat transfer process, so that its integral performance may be improved to meet the demand of energy saving and low cost with the volume as small as possible and the weight as light as possible [5].…”

Section: Evolution Of Assembled Radiatorsmentioning

confidence: 99%

“…To reduce the computational load, the fin structure at the core is simplified to an area of porous medium during the simulation of airside heat transfer of the radiator. [14,15] Moreover, since the fins are periodically arranged, it is only necessary to conduct a numerical simulation of a single heat convection unit, and to properly simplify the calculation model in light of a symmetric boundary and periodic boundary. The author establishes an analytical model by taking one radiating tube and ten half-symmetrical radiating fans (1mm interval) of each radiator, as illustrated in Figure 4.…”

Section: Simplification and Establishment Of Geometric Modelmentioning

confidence: 99%

Comparative Study on the Performance of Flat Tube Type and Wasp-Waisted Tube Type Radiators

Huang¹,

Chen²,

Li³

et al. 2016

IJHT

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Heat dissipation improvement has always been one of the difficulties in research on assembled radiators. On the basis of the existing flat-tube type assembled radiator, a wasp-waisted tube type assembled radiator optimizes the shape of the radiating tube to form a new type of assembled radiator. In this paper, the heat dissipation performance of flat tube type and wasp-waisted tube type radiators is compared through simulation and experiment, leading to the conclusion that a wasp-waisted tube type assembled radiator has a higher wind temperature at the airside, lower wind resistance, and better heat transfer capacity because the "wasp-waist" of the radiating tube increases the area of the radiating fin. The study proves that the optimization of the shape of the radiating tube can improve the heat dissipation performance of assembled radiators. It provides a possible solution to improving heat dissipation; at the same time, the findings map out a new direction for research on how to improve the heat dissipation performance of assembled radiators.

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Flow and heat transfer enhancement in tube heat exchangers

Cited by 64 publications

References 99 publications

Investigation on Strength and Microstructural Evolution of Porous Cu/Cu Brazed Joints Using Cu-Ni-Sn-P Filler

Investigation on Strength and Microstructural Evolution of Porous Cu/Cu Brazed Joints Using Cu-Ni-Sn-P Filler

Influence of radiating tube type on heat dissipation of assembled radiators

Comparative Study on the Performance of Flat Tube Type and Wasp-Waisted Tube Type Radiators

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