Numerical analysis of flow and heat characteristic around micro-ribbed tube in heat exchanger system

Tu, Jianglin; Qi, Cong; Li, Keao; Tang, Zhibo

doi:10.1016/j.powtec.2021.10.009

Cited by 61 publications

(5 citation statements)

References 47 publications

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“…Authors have revealed that low Rayleigh numbers and intensive external cooling reflect a possibility to use the local thermal equilibrium approach. Some interesting results can also be found in [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 73%

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Thermogravitational Convective Flow and Energy Transport in an Electronic Cabinet with a Heat-Generating Element and Solid/Porous Finned Heat Sink

Pop

Sheremet

2021

Mathematics

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Heat transfer enhancement poses a significant challenge for engineers in various practical fields, including energy-efficient buildings, energy systems, and aviation technologies. The present research deals with the energy transport strengthening using the viscous fluid and solid/porous fins. Numerical simulation of natural convective energy transport of viscous fluid in a cooling cavity with a heat-generating element placed in a finned heat sink was performed. The heat-generating element is characterized by constant volumetric heat generation. The Darcy–Brinkman approach was employed for mathematical description of transport processes within the porous fins. The governing equations formulated using the non-primitive variables were solved by the finite difference method of the second-order accuracy. The influence of the fins material, number, and height on the flow structure and heat transfer was also studied. It was found that the mentioned parameters can be considered as control characteristics for heat transfer and fluid flow for the cooling system.

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Section: Introductionmentioning

confidence: 73%

“…The approximated relations were resolved by the Thomas method. Equations ( 12) and (17) were approximated employing the five-point differences. Obtained relations were carried out by the successive over relaxation technique.…”

Section: Solution Techniquementioning

confidence: 99%

Thermogravitational Convective Flow and Energy Transport in an Electronic Cabinet with a Heat-Generating Element and Solid/Porous Finned Heat Sink

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Sheremet

2021

Mathematics

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“…Wang et al used a silica–water (SiO 2 –H 2 O) nanofluid as a working medium and researched the effects of tube structure, twisted tape hole spacing, and hole shape on the flow and heat exchange characteristics of nanofluids in the tube by numerical simulation . Jianglin et al analyzed the effects of micro-rib structure types, number of ribs, height of ribs, pitch diameter ratio, mass fractions, and Reynolds numbers on the flow and heat transfer characteristics of tube-row channel heat exchangers . Chengchao et al.…”

Section: Introductionmentioning

confidence: 99%

“… 32 Jianglin et al analyzed the effects of micro-rib structure types, number of ribs, height of ribs, pitch diameter ratio, mass fractions, and Reynolds numbers on the flow and heat transfer characteristics of tube-row channel heat exchangers. 33 Chengchao et al. constructed a physical model of a heat pipe with an ordinary and modified surface to numerically simulate the thermal performance inside the heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effective Well Depth of Single U-Shaped Vertical Buried Pipes Based on Temperature Difference Analysis

Zhang¹,

Xin²

2023

ACS Omega

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A heat transfer model of a single U-shaped vertical buried pipe similar to an actual scenario is established, and the accuracy of the model is verified by experiments. The model is used to analyze the heat transfer performance of vertical buried pipe heat exchangers with well depths of 200, 160, 120, and 80 m. This includes the heat transfer per unit well depth, temperature change of the well wall and fluid along the pipe length, heat transfer coefficient, and section heat transfer validity. With the increase in well depth, the heat exchange per unit well depth decreases, and the proportion of heat exchange in the inlet section to the total heat exchange increases. When the well depths are 200, 160, 120, and 80 m, the last 10 m pipe sections have 30, 40.3, 53.7, and 66.4% of the heat exchange efficiencies of the initial 10 m pipe section, respectively. To obtain a reasonably effective well depth of a single U-shaped vertical buried pipe, it is necessary to comprehensively consider the heat exchange per unit well depth, the temperature difference between the well wall and the fluid, and the energy efficiency of the buried pipe section. Moreover, it should be analyzed in combination with economic factors.

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“…In addition, by optimizing the structure of the heat exchange tube of the solar collector, the same effect as adding nanoparticles can be achieved. On the one hand, the boundary layer can be destroyed by adding spoilers such as ties 28,29 or fins [30][31][32] to the heat exchange tube; on the other hand, wave-shaped, 33 sinusoidal, 34 and other structures can also be used to enhance the turbulence effect. Therefore, many scholars have done a lot of research on this.…”

Section: Introductionmentioning

confidence: 99%

Effect of symmetrical and asymmetrical structures of transverse tube on heat transfer performance of nanofluids in a solar collector system

Tang,

Jiang,

et al. 2023

Asia-Pacific J Chem Eng

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In an effort to enhance the heat transfer performance of solar collectors, this paper proposed to replace the smooth tube with symmetrical and asymmetrical transversely corrugated tubes, and to couple with SiO2‐H2O nanofluids for heat transfer of solar collectors. Effects of nanofluids mass fraction (w = .0%, .1%, .3%, and .5%), Reynolds number (3000, 4000, 5000, 6000, and 7000), and groove radius (1.5, 2, and 2.5 mm) on the flow and heat transfer properties of nanofluids in solar collectors were studied. The comprehensive evaluation index was used to consider the heat transfer property and flow resistance of fluid flow at the same time. Results showed that with the augment of nanofluids mass fraction, Reynolds number, and groove radius, the heat transfer enhancement performance of the collector becomes better. Among them, when the Reynolds number is 4000, the asymmetric transversely corrugated tube with a nanofluids mass fraction of .5% and a groove depth of 2.5 mm has the best comprehensive flow and heat transfer performance, and the comprehensive evaluation index can reach 1.62. The study results in this paper are beneficial to the coupling of nanofluids and transversely corrugated tubes and their application in the domain of enhanced heat transfer of solar collectors.

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Numerical analysis of flow and heat characteristic around micro-ribbed tube in heat exchanger system

Cited by 61 publications

References 47 publications

Thermogravitational Convective Flow and Energy Transport in an Electronic Cabinet with a Heat-Generating Element and Solid/Porous Finned Heat Sink

Thermogravitational Convective Flow and Energy Transport in an Electronic Cabinet with a Heat-Generating Element and Solid/Porous Finned Heat Sink

Study on the Effective Well Depth of Single U-Shaped Vertical Buried Pipes Based on Temperature Difference Analysis

Effect of symmetrical and asymmetrical structures of transverse tube on heat transfer performance of nanofluids in a solar collector system

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