International Journal of Thermofluid Science and Technology最新文献_第2页

Unsteady flow and heat transfer characteristics over the rounded and square leading-edge plate 圆形和方形前缘板上的非定常流动和传热特性

International Journal of Thermofluid Science and Technology Pub Date : 2023-06-01 DOI: 10.36963/ijtst.2023100202

Channarong Wantha

引用次数: 0

Thermal radiation effect on Non-Newtonian Casson fluid through a porous material over a magnetic field with buoyancy 非牛顿卡森流体在带浮力磁场上通过多孔材料的热辐射效应

International Journal of Thermofluid Science and Technology Pub Date : 2023-01-01 DOI: 10.36963/ijtst.2023100103

Seun Oyinkansola Mate, Adebowale Martins Obalalu, Olusegun Adebayo Ajala, Toyibat Bamidele Bakare, Amos Wale Ogunsola, Akintayo Oladimeji Akindele

{"title":"Thermal radiation effect on Non-Newtonian Casson fluid through a porous material over a magnetic field with buoyancy","authors":"Seun Oyinkansola Mate, Adebowale Martins Obalalu, Olusegun Adebayo Ajala, Toyibat Bamidele Bakare, Amos Wale Ogunsola, Akintayo Oladimeji Akindele","doi":"10.36963/ijtst.2023100103","DOIUrl":"https://doi.org/10.36963/ijtst.2023100103","url":null,"abstract":"The magnetohydrodynamic (MHD) chemically reactive of Casson non-Newtonian nanofluid flow on a two-dimensional incompressible steady from stretched sheet in a porous quiescent medium with buoyancy effect is investigated numerically. Additional effects included in the originality of the model are the applied magnetic field and solar radiation effect. The Chebyshev collocation method (CCM) was used to solve the ordinary differential equations (ODEs) with MATHEMATICA 11.3 software. The present tables and graphs show the performance of fluid physical quantities, momentum flow, energy distribution, nanoparticle concentration, and velocity for various values of applicable dimensionless numbers. The numerical outcomes demonstrate the effect of different physical parameters of the fluid, and it was observed that the velocity profile increased as the thermal and mass Grashof number increased due to an increase in buoyant force caused by heat transferred from the vertical plate to the fluid but decreased as the Casson parameter increased due to a decrease in its yield stress, porosity, and magnetic parameter. Also Analyses reveal that the thermal profile reduce with an increase in variable thermal conductivity parameter. This study will be of considerable economic value to marine engineers, mechanical engineers, physicists, chemical engineers, and others since its application will help them improve their operations.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69790128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influences of electrical conductivity of the cylindrical walls on heat transfer enhancement of nanofluid swirling flow 圆柱壁面电导率对纳米流体旋流强化传热的影响

International Journal of Thermofluid Science and Technology Pub Date : 2023-01-01 DOI: 10.36963/ijtst.2023100201

F. Madani, B. Mahfoud, Hibet Errahmane Mahfoud

{"title":"Influences of electrical conductivity of the cylindrical walls on heat transfer enhancement of nanofluid swirling flow","authors":"F. Madani, B. Mahfoud, Hibet Errahmane Mahfoud","doi":"10.36963/ijtst.2023100201","DOIUrl":"https://doi.org/10.36963/ijtst.2023100201","url":null,"abstract":"The swirling nanofluid flow driven by a revolving bottom disk of a cylindrical container under magnetic field effect and temperature gradient is examined in this study. The effects of the electrical conductivity of cylindrical walls’ on heat transfer enhancement are quantitatively investigated. The finite volume approach is used to solve the governing equations under the appropriate assumptions. This study considers four cases of combined electric conducting and insulating walls. The solid nanoparticle (copper) with volume fraction (ϕ = 0.1) is added to water. Calculations were done for fixed Reynolds number (Re=1000), Richardson number (0≤Ri ≤2), and various Hartmann numbers. The mean Nusselt number decreased as the Richardson number increased owing to stratification layers. These latter restrict heat exchanges between the cylinder’s hot and cold zones. The results show that within a particular range of Hartmann numbers, the Nusselt number increases, especially when the revolving lid is electrically conducting. The best heat transfer occurs when all of the walls are electrically conductive, which results in a 100% improvement at low Richardson values. Finally, the electrical conductivity of the revolving lid was a key factor in enhancing heat transfer.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69790159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation on pressure oscillations in steam condensation from injection of subcooled water 注入过冷水蒸汽冷凝过程压力振荡的数值研究

International Journal of Thermofluid Science and Technology Pub Date : 2023-01-01 DOI: 10.36963/ijtst.2023100101

A. Quddus, Ajmal Shah, K. Qureshi, Ahmad Tahir, Ammar Ahmad, M. Iqbal, M. K. Ayub, Atif Mehmood

{"title":"Numerical investigation on pressure oscillations in steam condensation from injection of subcooled water","authors":"A. Quddus, Ajmal Shah, K. Qureshi, Ahmad Tahir, Ammar Ahmad, M. Iqbal, M. K. Ayub, Atif Mehmood","doi":"10.36963/ijtst.2023100101","DOIUrl":"https://doi.org/10.36963/ijtst.2023100101","url":null,"abstract":"Steam-water direct contact condensation phenomenon is commonly found in many industries like chemical process industry, nuclear industry etc. In this work the injection of subcooled water into a steam filled pipe has been studied computationally. As a result of steam-water interaction within the pipe the pressure oscillates, which may cause damage to piping system or equipment. The effects of water inlet velocity, water inlet temperature, steam pressure and degree of steam superheating have been studied on the amplitude of pressure oscillations. The first and second dominant frequencies of pressure oscillations have also been obtained and studied. For most of the cases, the first dominant frequency peak was observed in the range ~ 0-1400 Hz whereas, the second dominant frequency peak was in the range ~ 2500 Hz – 3000 Hz. The first pressure peak was observed near the inlet of subcooled water such that its amplitude was increasing with increasing inlet water velocity but was nearly independent of inlet water temperature. Similarly, degree of steam superheating has no noticeable effects on pressure oscillations. It was observed that at a constant water temperature and water injecting velocity, the location of the pressure peaks was independent during the study. Further, the dominant frequency prediction map has been developed for the steam-water interaction in a pipe. The present study is assumed to be beneficial towards unfolds various important facts regarding steam-water interaction in the relevant industrial applications.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69790029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Onset of double diffusive surface-tension driven convection in fluid layer overlying a layer of anisotropic porous layer with soret effect 在各向异性多孔层上的流体层中，双扩散表面张力驱动对流的开始具有索雷效应

International Journal of Thermofluid Science and Technology Pub Date : 2023-01-01 DOI: 10.36963/ijtst.2023100102

G. Y. H.

引用次数: 0

Modeling and simulation of suction-driven flow and heat transfer with temperature-dependent thermal conductivity in a porous channel 多孔通道内具有温度相关导热系数的吸力驱动流动和传热的建模与仿真

International Journal of Thermofluid Science and Technology Pub Date : 2022-02-12 DOI: 10.36963/ijtst.2022090304

V. N. Nsoga, J. Hona

引用次数: 0

CFD Analysis to Predict Flow Behavior for Design and Operation of Tarbela Dam Reservoir for Different Environmental Conditions CFD分析预测不同环境条件下Tarbela大坝水库设计和运行的流动特性

International Journal of Thermofluid Science and Technology Pub Date : 2022-02-12 DOI: 10.36963/ijtst.2022090302

M. Abid, M. U. R. Siddiqi, A. A. Noon, M. Tahir, A. Sharif, S. Siddiqi, N. Ullah, T. Habib, M. Shayan

引用次数: 0

CFD investigation of flow reversal in inverted U-tube steam generator under two-phase natural circulation 两相自然循环条件下倒u管蒸汽发生器回流的CFD研究

International Journal of Thermofluid Science and Technology Pub Date : 2022-02-12 DOI: 10.36963/ijtst.2022090301

W. Riaz, A. Ahmed, K. R. Qureshi

引用次数: 0

Combined impact of variable viscosity and throughflow effects on the onset of convection in an anisotropic porous layer 变粘度和通流效应对各向异性多孔层中对流开始的综合影响

International Journal of Thermofluid Science and Technology Pub Date : 2022-02-12 DOI: 10.36963/ijtst.2022090303

Y. Gangadharaiah, H. Nagarathnamma, S. Suma, K. Ananda

引用次数: 1

Experimental study on acoustic and aerodynamic improvement of the hemiptera-inspired propeller planform 半翅目螺旋桨外形声学和气动特性改进的实验研究

International Journal of Thermofluid Science and Technology Pub Date : 2022-01-01 DOI: 10.36963/ijtst.2022090203

F. Moslem, M. Masdari, K. Fedir, B. Moslem

{"title":"Experimental study on acoustic and aerodynamic improvement of the hemiptera-inspired propeller planform","authors":"F. Moslem, M. Masdari, K. Fedir, B. Moslem","doi":"10.36963/ijtst.2022090203","DOIUrl":"https://doi.org/10.36963/ijtst.2022090203","url":null,"abstract":"The multi-rotors have a short working duration and produce excessive noise, which is insufficient for complicated jobs and has a negative impact on human and animal health. Nonetheless, their market is growing in popularity. As a result, low-noise products are more competitive, and aerodynamic and acoustic enhancements are essential. The goal of this research is to create a small bioinspired propeller with the same power input as a conventional propeller that achieves the same or better aerodynamic performance while reducing noise. Accordingly, an experiment looked at the effects of different operating circumstances and geometric factors on the aerodynamic and aeroacoustic performance of a small propeller with a distinctive planform shape inspired by Hemiptera. This propeller was run at eleven rotational speeds ranging from 3000 to 8000 RPM with no freestream velocity to simulate hover circumstances. When compared to the baseline propeller, the Hemiptera propeller produce greater thrust for the same power source, reduce harmonic and broadband noise, and offer a better noise level. This noise reduction might be attributed to a decrease in Hemiptera propeller force fluctuation. Furthermore, its rotational speed is lower and its figure of merit is higher than the baseline propeller at hover flying with 3N thrust. Moreover, at this force, the Hemiptera propeller shows a 2.8W power reduction and a 5 dB decrease in acoustic signature. When it comes to hover efficiency, the Hemiptera propeller outperforms the baseline propeller across the board, regardless of thrust.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42683089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0