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由热传递速率谈供暖水管改造的必要性
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作者 庄绍林 《山东工业技术》 2019年第1期99-99,共1页
传统的水暖供热管道,是输送管道与回水管道各自独立,浪费能源及材料。改为输送管道与回水管合为外观一体。输送管道置于回水管道的轴心。利用输送管道的外壁与回水管道的内壁空间回水。这样降低输送管道水与外界温差,达到节能的目的。
关键词 热传递速率 供暖水管改造 温差值 回水管轴心 节能效率
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Heat transfer intensification in hydromagnetic and radiative 3D unsteady flow regimes: A comparative theoretical investigation for aluminum and γ-aluminum oxides nanoparticles 被引量:2
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作者 Naveed AHMED ADNAN +3 位作者 Umar KHAN Syed Zulfiqar Ali ZAIDI Imran FAISAL Syed Tauseef MOHYUD-DIN 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1233-1249,共17页
This article investigates the colloidal study for water and ethylene glycol based nanofluids.The effects of Lorentz forces and thermal radiation are considered.The process of non-dimensionalities of governing equation... This article investigates the colloidal study for water and ethylene glycol based nanofluids.The effects of Lorentz forces and thermal radiation are considered.The process of non-dimensionalities of governing equations is carried out successfully by means of similarity variables.Then,the resultant nonlinear nature of flow model is treated numerically via Runge-Kutta scheme.The characteristics of various pertinent flow parameters on the velocity,temperature,streamlines and isotherms are discussed graphically.It is inspected that the Lorentz forces favors the rotational velocity and rotational parameter opposes it.Intensification in the nanofluids temperature is observed for volumetric fraction and thermal radiation parameter and dominating trend is noted for γ-aluminum nanofluid.Furthermore,for higher rotational parameter,reverse flow is investigated.To provoke the validity of the present work,comparison between current and literature results is presented which shows an excellent agreement.It is examined that rotation favors the velocity of the fluid and more radiative fluid enhances the fluid temperature.Moreover,it is inspected that upturns in volumetric fraction improves the thermal and electrical conductivities. 展开更多
关键词 conventional fluids aluminum and γ-aluminum oxides magnetic field thermal radiation Runge-Kutta scheme shear stress local rate of heat transfer
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