Summary and evaluation on single-phase heat transfer enhancement techniques of liquid laminar and turbulent pipe flow

Ji, Wen-Tao; Jacobi, Anthony M.; He, Yingli; Wen, Tao

doi:10.1016/j.ijheatmasstransfer.2015.04.008

Cited by 96 publications

(18 citation statements)

References 93 publications

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“…where the local loss factor ξ bend is calculated from the experimental equations in [42,43]. L/2 is the bending radius (half of the cell's center distance L in Figure 3c).…”

Section: Of 22mentioning

confidence: 99%

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

et al. 2020

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory.Abstract: High power cylindrical Ni-MH battery cells have a heavy heat load because of their high discharge rate and large equivalent internal resistance. This heavy heat load, together with an imbalanced flow in parallel liquid cooling systems, can lead to variances in the temperature of each cell in the entire battery pack, thereby reducing the life cycle of the battery pack. In this paper, a parallel-series combined liquid cooling system for a 288V Ni-MH battery pack was designed, and several parameters that influence the flow balance of the system by heat transfer and fluid dynamics were calculated. Then, a thermal-fluid simulation was executed with different parameters using StarCCM+ software, and the simulation results were validated by a battery pack temperature experiment on a bench and in a vehicle. The results indicate that the cell's temperature and temperature differences can be kept within an ideal range. We also determined that within the battery power requirements and structural spacing limits, the total flow rate of the cooling liquid, the cross-sectional area ratio of the main pipe to the branch pipes, and the number of internal supporting walls in each branch pipe need to be large enough to minimize the cell's maximum temperature and temperature differences.reduces the life cycle of a battery pack. At temperatures exceeding 50 • C, charging efficiency and battery life deteriorate the most rapidly due to heat [10,11]. Therefore, it is necessary to pay more attention to the research of battery thermal management system (BTMS), which is very important for battery performance, life and safety. Pesaran et al. [12] noted that Ni-MH and Li-ion batteries' ideal operating temperatures range from 25 to 40 • C, and the temperature differences between the cells within a battery pack should be below 5 • C. Literature ReviewPlenty of works have been done in the field of battery thermal management system for commercially sold EVs and HEVs in the market, such as direct air cooling, liquid cooling, phase change material, heat pipes, hybrid cooling system and other emerging cooling technologies.The air-cooling system uses air as the heat exchange medium to let the air sweep across the battery surface to take away the heat generated by the battery. The air-cooling system is the most widely used cooling mode with simple structure, light weight, low cost and convenient maintenance. Chen YF et al. [13] showed that the thermal conductivity of Li-ion battery was low, and air cooling alone could not meet the requirements of thermal management. Harmel et al. [14] and Chen et al. [15] analyzed the thermal balance of li-ion batteries and found that when the wind speed reached a certain degree, increasing the wind speed had little effect on the heat dissipation effect of the batteries. Nelson et al. [16] have shown that the cooling effect of an air-co...

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“…where the local loss factor ξ bend is calculated from the experimental equations in [42,43]. L/2 is the bending radius (half of the cell's center distance L in Figure 3c).…”

Section: Of 22mentioning

confidence: 99%

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

et al. 2020

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“…In order to strengthen the single-phase convection heat transfer technology, many heat exchanger elements have been developed, the internally finned tube is one of them. Ji et al (2015) found that their thermal-hydraulic performance is the best among all enhanced tubes through a comprehensive literature review. Much work has been done to investigate the heat transfer characteristics of internally finned tubes in condensation (Seo and Kim, 2000;Kim et al, 2002;Yu et al, 2002;Yun et al, 2002) and evaporation (Chamra and Webb, 1996;Chamra et al, 2004Chamra et al, , 2005Chamra and Mago, 2006), but the heat transfer characteristics of single-phase in these tubes are not thoroughly understood for lack of research.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes

et al. 2019

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In this study, single-phase heat transfer enhancement in internally finned tubes is investigated numerically. The influence of fin number, helix angle, fin height, fin width, and shape on the flow and heat transfer characteristics is studied. The research results indicate that the resistance coefficient and Nusselt number both increase with the increment of these parameters, among which the helix angle has the largest impact on the heat transfer enhancement. In addition, the shape of fins also has a small effect on the flow and heat transfer, and the heat transfer effect of triangular fins is the best.

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“…Examples include rib turbulators, dimpled surfaces, twisted tapes, wire coils, microfins, coiled tubes, and so forth. Recent and comprehensive literature reviews on these techniques can be found in Bergles, Liu, Ligrani and Ji et al…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental evaluation of heat transfer in helically corrugated tubes

et al. 2017

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The enhancement of convective heat transfer in single-phase heat transfer through the use of helicoidally corrugated tubes has been studied numerically. By comparing the large eddy simulation (LES) results with detailed Stereo-PIV and Liquid Crystal Thermography measurements obtained at the von Karman Institute for Fluid Dynamics (VKI), a validated numerical framework was obtained. Heat transfer enhancements of 83-119% were seen, at the cost of pressure losses that were approximately 5.6 to 6.7 times higher than for a bare tube. To extrapolate the results to industrial Reynolds numbers at which experimental data is scarce, the simulation data was used to develop an improved near-wall Reynolds stress transport model (RSTM) that more accurately describes the heat flux vector. Comparison of both global and local flow characteristics at different Reynolds numbers confirms that the approach allows more accurate predictions over a wider range of design and operating parameters than using two-equation turbulence models, while the computational cost is still significantly lower than LES.

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Summary and evaluation on single-phase heat transfer enhancement techniques of liquid laminar and turbulent pipe flow

Cited by 96 publications

References 93 publications

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

The Design and Investigation of a Cooling System for a High Power Ni-MH Battery Pack in Hybrid Electric Vehicles

Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes

Numerical and experimental evaluation of heat transfer in helically corrugated tubes

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