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Numerical Simulation of flow and heat transfer from Slot Jets Impinging on a Cylindrical Convex Surface

Journal of Thermal Science 2011年第5期20卷 460-466页

作者： Zeyi JIANG Cuicui LIU Xinxin ZHANG Qiang MA Yusheng SUN School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China China Aviation Planning and Construction Development Co LTD Beijing 102206 China

flow and heat transfer characteristics of slot jets impingement to a cylindrical convex surface are numerically *** turbulence models have been determined through comparison with the experimental *** structures are described and impingement heat transfer characteristics are *** effects of Re,H/B and D/B on single-slot jets impingement heat transfer are analyzed and heat transfer characteristics of multiple-slot jets are *** results show that:Gas flows along the convex surface and boundary layer separation occurs in both single and multiple-slot jets impingement.A maximum stagnation Nu appears at H/B=8 and the local Nu decreases with increasing H/B in the region far away from the *** Nu in the stagnation region decreases with increasing D/B but the Nu is nearly the same in the region far away from the *** gradient is an important factor on heat transfer *** of the Num for single-slot,double-slot and quadric-slot jets impinging on a convex surface are *** indicates the effects of Re and D/B on Num could become more important in less slot jets impingement.

关键词： slot jets impingement convex surface numerical simulation flow and heat transfer

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Experimental study of the flow and heat transfer of a gas–water mixture through a packed channel

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Science Bulletin 2016年第5期61卷 406-415页

作者： Xiaolei Zhu Xiaofeng Sui Yan Zhao Ji'an Meng Zhixin Li School of Aerospace Tsinghua University Beijing Yuanshen Energy Saving Technology Co. Ltd. Thermal Research Institute Tianjin University

Waste heat recovery from the flue gas of gasfired boilers was studied experimentally by measuring the flow and heat transfer of air and water through six kinds of packing with saturated humid air as the simulated flue *** experiments measured the effects of inlet air temperature, inlet air velocity and circulating water flow rate on the flow and heat transfer. The results show that higher inlet air temperatures and lower inlet air velocities lower the flow resistance and increase the heat transfer coefficient. The stainless steel packing had better surface wettability and larger thermal conductivity than the plastic packing, which enhanced the heat transfer between the water and the saturated moist air. When both the flow resistance reduction and the heat transfer enhancement were considered, the experimental results gave an optimal packing-specific surface area. A packed heat exchanger tower was designed for waste heat recovery from the flue gas of gas-fired boilers based on the experimental results which had better flow and heat transfer characteristics with lower pump and fan power consumption, more stable system operation and less thermal fluctuations compared with a non-packed heat transfer system with atomized water.

关键词： Flue gas waste heat recovery flow and heat transfer Moist air Packed heat exchanger tower

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Numerical Investigation on flow and heat transfer Performance of Supercritical Carbon Dioxide Based on Variable Turbulent Prandtlnumber Model

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Mechanical Engineering Science 2021年第2期3卷 1-8页

作者： Xiaokai LIU Haiyan ZHANG Keyong CHENG Xiulan HUAI Haiyan LIAO Zhongmei ZHANG Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Nanjing Institute of Future Energy System Nanjing 210000China CHN Energy New Energy Technology Research Institute CO. LTD.Beijing 102206China

flow and heat transfer characteristic of supercritical carbon dioxide(SCO_(2))are numerically investigated in the horizontal and vertical *** turbulent Prandtl number model could well describe the behavior of SCO_(2) affected by the *** the cooling condition,the heat transfer performance of SCO_(2) along the upward direction is best and that along the downward direction is worst when bulk fluid temperatures are below the pseudocritical *** the ratio of heat flux to mass flux could decrease the difference of convective heat transfer coefficient in three flow *** the heating condition,heat transfer deterioration only occurs in vertical upward and horizontal flow *** transfer deterioration of SCO_(2) could be delayed by increasing the mass flux and the deterioration degree is weakened in the second half of tube along the vertical upward flow *** with the straight tube,the corrugated tube shows better comprehensive thermal performance.

关键词： Supercritical carbon dioxide Turbulent Prandtl number flow and heat transfer Field synergy principle Numerical investigation

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Exploring the enigmatic interplay between polymers and nanoparticles in a non-Newtonian viscoelastic fluid

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第11期75卷 161-169页

作者： Khan, R. Alameer, A. Afraz, M. Ahmad, A. Nawaz, R. Khan, Y. Univ Campania Luigi Vanvitelli Dipartimento Matemat & Fis I-81100 Caserta Italy Univ Hafr Al Batin Dept Math Hafar al Batin 31991 Saudi Arabia COMSATS Univ Islamabad Dept Math Islamabad 44000 Pakistan Gulf Univ Sci & Technol Ctr Appl Math & Bioinformat CAMB Hawally 32093 Kuwait

Non-Newtonian fluids have variable viscosity in response to shear rate, and the presence of polymers and nanoparticles further modifies their flow characteristics. In this paper, the effects of polymers and nanoparticles on mass and heat transfer control, drag reduction, boundary layer flow development in a polymeric finitely extensible nonlinear elastic-Peterlin (FENE-P) fluid, and the significance of nanoscience in modern day life are discussed. We examine the behavior of polymer additives by utilizing a dispersion model in conjunction with the polymeric FENE-P model. Our work includes a comparison with Cortell's earlier work, which only looked at the behavior of polymer's inclusion into the base fluid. This research investigates numerically how the inclusion of polymers and nanoparticles into the base fluid reduces drag while increasing heat and mass transfer. The observed variations in skin friction, reduced Nusselt, and Sherwood numbers indicate an intriguing correlation between the rates of heat and mass transport and surface drag. More precisely, as the heat and mass transfer efficiency improve, the surface encounters less resistance, which is commonly referred to as drag. In summary, the research highlights the capability of polymers and nanoparticles to effectively modify fluid dynamics, minimize drag, and enhance mass and heat transfer inside the flow region. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Polymers FENE-P model Nanofluids Radiative heat flux flow and heat transfer Numerical solution

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普洱水泥厂砌块产销两旺

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建筑砌块与砌块建筑 1996年第1期 25-25页

普洱水泥厂砌块产销两旺云南普洱水泥厂预制车间不断完善内部管理，紧跟市场组织生产畅销产品，加强设备维修保养，提高劳动生产率，产量、销量和质量都比前年同期有了较大的提高。去年前１０个月共生产空心砌块５０９４５５块，比前年... 详细信息

普洱水泥厂砌块产销两旺云南普洱水泥厂预制车间不断完善内部管理，紧跟市场组织生产畅销产品，加强设备维修保养，提高劳动生产率，产量、销量和质量都比前年同期有了较大的提高。去年前１０个月共生产空心砌块５０９４５５块，比前年同期增长了２２，５％，销售空心砌块...

关键词： glass furnace flow and heat transfer model experiment similarity criteria

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