Energy and entropy evaluation and two-phase simulation of nanoparticles within a solar unit with impose of new turbulator

Sheikholeslami, M.; Jafaryar, M.; Abohamzeh, Elham; Shafee, Ahmad; Babazadeh, Houman

doi:10.1016/j.seta.2020.100727

Cited by 43 publications

(20 citation statements)

References 30 publications

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“…Also, as the instability increased, the HT and the coefficient of friction increased. Sheikholeslami et al (2020) made a numerical study of turbulator generated entropy on the flow field and HT of water-copper oxide NFs by considering a two-phase model in a solar system. Their results show that the greatest decrease in entropy production with increasing Re occurred when using a twisted barrier.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and fluid flow analysis using nanofluids in diamond-shaped cavities with novel obstacles

Aghaei

Bhattacharyya

Dezfulizadeh

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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This work computationally explores the two-phase flow of nanofluids and their thermal energy transport coefficients in 3D diamond-shaped cavities with square-shaped barriers having reducing dimensions. Materials with two emissivity values, ε = 0.3 and 0.9, have been considered to investigate the effect of the radiation thermal energy transport coefficient while the hot side is maintained at 400 or 500 K. Two values of the Rayleigh number, Ra = 10 6 and 10 8 , are used for the study. Cu nanoparticles (NPs) with an average size of 25 nm have been used at a concentration of 0.01-0.05% in the base fluid. The temperature gradients and thermal energy transport coefficient characteristics are enhanced by raising the volume concentration of nanoparticles, but the streamlines do not alter substantially. By increasing Ra, the thermal energy transport coefficient rate is further augmented. It is also found that increasing the Ra and volume concentration of NPs results in enhanced heat transfer inside a cavity, while a change in the emissivity coefficient has no significant impact on the thermal and flow characteristics of the nanofluid. For each case, there is an optimum NP volume fraction for each model that leads to the highest Nusselt number.

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Section: Introductionmentioning

confidence: 99%

Heat transfer and fluid flow analysis using nanofluids in diamond-shaped cavities with novel obstacles

Aghaei

Bhattacharyya

Dezfulizadeh

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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“…[35][36][37][38][39][40] The key advantage of the computational approach is low cost and informative results about details of flow feature. [41][42][43][44][45] Thus, several codes and software are developed for the simulation of compressible flow inside the scramjet engine. [45][46][47][48] The advance in the current commercial software easily enables the researchers to investigate different fuel mixing systems at supersonic free steam.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, computational fluid dynamics as a virtual laboratory is extensively used for research in this field 35‐40 . The key advantage of the computational approach is low cost and informative results about details of flow feature 41‐45 . Thus, several codes and software are developed for the simulation of compressible flow inside the scramjet engine 45‐48 .…”

Section: Introductionmentioning

confidence: 99%

Computational investigation of multi hydrogen jets at inclined supersonic flow

2020

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Summary Scramjet design is directly associated with the fuel mixing inside the combustor. In this study, the influences of the free stream angle on the fuel mixing zone of eight microjets are fully investigated. This study mainly tries to disclose the importance of the fuel jet interaction with a supersonic free stream on penetration and distribution of hydrogen jets. The effects of jet paces and different free stream angles are fully examined in this work. For the computational study, CFD numerical method is applied to obtain the fuel jet structure at supersonic cross‐flow. RANS equations with SST turbulence scheme is employed for the simulation of our model. Our simulations show that a positive angle of supersonic incoming flow is effective for the uniform expansion of the fuel mixing zone inside the combustor. According to our findings, increasing the angles of the free stream declines the mixing zone when the fuel jet interaction of the last jets with main stream decreases. Our results indicate that mixing efficiency of ‐20° is about 30% more than other angles.

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“…Entropy analysis in a solar unit has been investigated by Sheikholeslami et al. 12 with the inflict of new turbulator. They remarked that the lowering of entropy generation can be achieved with larger Reynolds number for perforated barrier twisted tape.…”

Section: Introductionmentioning

confidence: 99%

Irreversibility analysis of nanofluid flow in a vertical microchannel with the influence of particle shape

Sindhu

Gireesha

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Augmentation of thermal performance in heat transfer system has become research hotspot nowadays. Numerous techniques are carried out to pick up the effective heat transport mechanism for designing high efficient thermal frameworks which has extensive practical uses in industrial process. In the current study, mixture model has been implemented for better describing the characteristics of nanoparticles in a vertical microchannel. The nondimensional equations are computed by using Runge Kutta Fehlberg method. Effect of heat source, buoyancy force and convective boundary on the thermal system has been demonstrated. The role of spheroidal nanoparticles on thermal conductivity of the conventional fluid has been examined. The causes of irreversibilities in a microchannel due to nanoliquid flow has been reported in the current research work. It is obtained that Aluminum foam has higher thermal field compared to Al2 O3. Entropy generation is reduced by lowering Eckert number and Grashof number. It is explored that nanofluid containing oblate shaped nanoparticels has higher thermal conductivity ratio.

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Energy and entropy evaluation and two-phase simulation of nanoparticles within a solar unit with impose of new turbulator

Cited by 43 publications

References 30 publications

Heat transfer and fluid flow analysis using nanofluids in diamond-shaped cavities with novel obstacles

Heat transfer and fluid flow analysis using nanofluids in diamond-shaped cavities with novel obstacles

Computational investigation of multi hydrogen jets at inclined supersonic flow

Irreversibility analysis of nanofluid flow in a vertical microchannel with the influence of particle shape

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