Flow and heat transfer characteristics of supercritical hydrogen in unilateral heated channels with micro-ribs

Li, Xin; Zhang, Silong; Zuo, Jingying; Jun, Wei; Zhou, Xingyu; Bao, Wenzhong

doi:10.1016/j.applthermaleng.2022.119900

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…However, the increase in errors at lower ribs height could mean that RANS is not capable to capture with high accuracy the swirling flows caused by little ribs. However, the reliability of k − ω − SST model with respect to other RANS models, to Reynolds stress model, and to υ 2 − f model has been proved in literature also for ribs with very small height, such as microribs with e/H 0.1 [12]. The presented results are slightly less accurate than results presented in [13], where the ribs were 90°staggered, meaning that increasing the complexity of the channel RANS accuracy decreases.…”

Section: Discussionmentioning

confidence: 55%

Accuracy in evaluating convective heat transfer coefficient by RANS CFD simulations in a rectangular channel with high aspect ratio and 60° tilted staggered ribs

Corti,

Gramazio,

Fustinoni

et al. 2024

J. Phys.: Conf. Ser.

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A numerical analysis of heat transfer characteristics of an air flow through a narrow rectangular channel of 1:10 aspect ratio with ribbed surfaces has been carried out, by means of a CFD commercial code, exploiting Reynolds Averaged Navier-Stokes (RANS) equations. The channel is 120 mm wide, 840 mm long, with 60° tilted staggered ribs. Ribs have a square cross section with two different side heights (2 mm and 4 mm) and three different values of dimensionless pitch (10, 20 and 40). The numerical results have been compared with experimental data obtained by the authors inside a ribbed channel both with same geometry and operating conditions as one numerically modelled. Agreement between numerical and experimental data on convective global heat transfer coefficient, i.e., averaged over the whole channel, is discussed for the six different configurations considered. Moreover, performances are presented by considering at the same time both heat transfer enhancement and pressure-drop penalization, highlighting strengths and weaknesses per each configuration. This work is aimed at finding a suitable configuration of a CFD model with RANS that will allow authors to apply it to the range of dimensionless pitches and side heights during early design-phases of parametric studies.

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Section: Discussionmentioning

confidence: 55%

Accuracy in evaluating convective heat transfer coefficient by RANS CFD simulations in a rectangular channel with high aspect ratio and 60° tilted staggered ribs

Corti,

Gramazio,

Fustinoni

et al. 2024

J. Phys.: Conf. Ser.

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“…In addition, the alternating combustion process drives the mover's reciprocating motion, cutting the magnetic field lines to produce electrical energy, which is consumed by the load or stored by the energy storage elements. More information about the operating characteristics of the free-piston engine can be found in [41,47].…”

Section: Linear Generator For Free-piston Enginesmentioning

confidence: 99%

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Wei,

Zuo,

Jia

et al. 2024

International Journal of Energy Research

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Renewable fuels attract more attention owing to reduction of both air pollution and greenhouse gas emissions compared to fossil fuels. The free-piston engine generator is a new energy conversion with compact structure, multifuel combustion mode possibility, and less friction loss, and it can be applied to a variety of renewable fuels. This study investigated the effect of operating parameters on power generation and motion characteristics for free-piston engine generator. A test bench and a detailed and validated numerical model of the free-piston engine generator were presented. Results show that with the increase of the average velocity, the output power root mean square (RMS) and efficiency of the generator gradually increase. The output power RMS grows rapidly, whereas the generator efficiency gradually stabilizes. Under the same average velocity but different strokes and frequencies, the generator power and efficiency are the same. This result means that the multiple-point operating condition can achieve the same output power and generator efficiency goals. Moreover, the optimal operating conditions can be selected comprehensively, considering factors such as fuel properties, combustion efficiency, and performance. The influence of the generator on motion characteristics of the system under pure resistive load and high-frequency operation should be noted.

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Analysis of Supercritical Hydrocarbon Fuel as a Coolant for Improved Thermal Performance of Scramjet

Rathan Babu,

Gudıkandula,

Sai Puravardhan

et al. 2024

Advances in Science, Technology &Amp; Innovation

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Flow and heat transfer characteristics of supercritical hydrogen in unilateral heated channels with micro-ribs

Cited by 12 publications

References 30 publications

Accuracy in evaluating convective heat transfer coefficient by RANS CFD simulations in a rectangular channel with high aspect ratio and 60° tilted staggered ribs

Accuracy in evaluating convective heat transfer coefficient by RANS CFD simulations in a rectangular channel with high aspect ratio and 60° tilted staggered ribs

Performance Characteristic of Permanent Magnet Linear Generator for Energy Conversion with Renewable Fuels on Free-Piston Engines

Analysis of Supercritical Hydrocarbon Fuel as a Coolant for Improved Thermal Performance of Scramjet

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