Numerical and Experimental Study of Flow and Convective Heat Transfer
                    on a Rotor of a Discoidal Machine With Eccentric Impinging Jet

Haidar, Chadia; Boutarfa, Rachid; Sennoune, Mohamed; Harmand, Souad

doi:10.1115/1.4044207

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…This leads to greater levels of the tangential deformation rate proximate to the rotor, which in turn promotes improved heat exchange in this region. In our study, an indepth comparison of our results with those presented in reference works [6,25] reveals a significant observation related to the Nusselt number. Our meticulous analysis shows a remarkable constancy of the Nusselt number over the entire rotor surface.…”

Section: Local and Medium Profiles Of Nusseltsupporting

confidence: 77%

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Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Hannaoui,

Boutarfa,

Haidar

2024

FHMT

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The proposed work focuses on the in-depth study of convective heat transfer in the unconfined air gap of a discoidal rotor-stator system. The rotary cooling mechanism is achieved by the injection of two air jets, while the cavity geometry is characterized by a dimensionless parameter G. The numerical analysis primarily concentrated on the effect of flow velocity and rotation on the heat exchange process. More precisely, the range of analysis extends from the rotational Reynolds number Re ω = 2.35 × 10 5 to Re ω = 5.04 × 10 5 , while varying the Reynolds value of the jet in a range from 16 × 10 3 to 55.46 × 10 3 . To carry out this analysis, a numerical simulation was conducted with Ansys-Fluent software, using the RSM turbulence model. The results of the study significantly reveal the impact of rotation on heat exchange transfer within the cavity, identifying two distinct zones of fluid recirculation. These zones exhibit remarkable heat transfer characteristics, contributing to a better understanding of the complex mechanisms governing heat transfer in this particular technological context. Additionally, the analysis of radial mean velocity distributions, as well as local and mean Nusselt numbers, provides further insight into the heat transfer performance of this unique configuration.

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Section: Local and Medium Profiles Of Nusseltsupporting

confidence: 77%

“…This observation conclusively suggests that our experimental configuration achieves full rotor cooling. The work of [6,25] played a crucial role in establishing a baseline for our study. The concordance of the results obtained reinforces the validity of our numerical approach.…”

Section: Local and Medium Profiles Of Nusseltmentioning

confidence: 99%

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Hannaoui,

Boutarfa,

Haidar

2024

FHMT

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Effect of Freeze Pipe Eccentricity in Selective Artificial Ground Freezing Applications

Zueter

Madiseh

Hassani

et al. 2021

Journal of Thermal Science and Engineering Applications

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Building concentric tubes is one of biggest practical challenges in the construction of freeze-pipes of selective artificial ground freezing (S-AGF) applications for underground mines. In this study, the influence of tubes eccentricity on phase-front expansion (i.e., expansion of the frozen body) and energy consumption of S-AGF systems is analyzed. A 1+1D semi-conjugate model that solves two-phase transient energy conservation equation is derived based on the enthalpy method. The 1+1D model is firstly validated against experimental data and then verified with a fully-conjugate model from our previous work. After that, the 1+1D model is extended to a field-scale of typical underground mines to examine the effect of freeze-pipe eccentricity. The results show that concentric freeze-pipes form the desired frozen ground volume 15% faster than eccentric freeze-pipes. Also, the geometrical profile of the phase-transition-front of the frozen ground is found to be significantly influenced by the freeze-pipe eccentricity. Furthermore, in the passive zone, where S-AGF coolants are isolated from the ground to reduce energy consumption, freeze pipe eccentricity can increase the coolant heat gain by 20%. This percentage can increase up to 200 % if radiation heat transfer is minimized.

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Flow and Convective Exchanges Study in Rotor-Stator System With Eccentric Impinging Jet

Haidar

Hannaoui

Boutarfa

et al. 2023

ASME Journal of Heat and Mass Transfer

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This paper investigates numerically and experimentally the flow structure and convective heat transfers in an unconfined air gap of a discoid technology rotor–stator system. The cavity between the interdisk is defined by dimensionless spacing varying between G = 0.02 (Haidar et al., 2020, “Numerical and Experimental Study of Flow and Convective Heat Transfer on a Rotor of a Discoidal Machine With Eccentric Impinging Jet,” J. Therm. Sci. Eng. Appl., 12(2), 021012) and G = 0.16. For experimental data, an infrared thermography is applied to obtain a measurement of the rotor surface temperatures and a steady-state energy equation is solved to evaluate the local convective coefficients. A numerical study is performed with a computational code ansys-fluent and based to apply two different turbulence models named the Reynolds stress model (RSM) and k–ε renormalization group (RNG). The results of the numerical simulation are compared with experimental results on heat transfer for the rotational Reynolds number ranging from 2.38×105 to 5.44×105, the jet Reynolds numbers varying from 16.6×103 to 49.6×103, and for dimensionless spacing G between 0.04 and 0.16. Three heat transfer zones on the rotating disk surface are identified. A good accord between a numerical result and experimental data was obtained. Finally, a correlation relating the Nusselt number to the rotational Reynolds number, jet Reynolds number, and dimensionless spacing varying from 0.02 to 0.16 is proposed.

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Numerical and Experimental Study of Flow and Convective Heat Transfer on a Rotor of a Discoidal Machine With Eccentric Impinging Jet

Cited by 3 publications

References 21 publications

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Effect of Freeze Pipe Eccentricity in Selective Artificial Ground Freezing Applications

Flow and Convective Exchanges Study in Rotor-Stator System With Eccentric Impinging Jet

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