نتایج جستجو برای: average nusselt number

تعداد نتایج: 1468119  

Journal: :international journal of nano dimension 0
r. aghayari young researchers and elite club, shahrood branch, islamic azad university, shahrood, iran h. maddah department of chemistry, sciences faculty, arak branch, islamic azad university, arak, iran j. baghbani arani department of chemical engineering, faculty of engineering, arak university, arak, iran h. mohammadiun assistant professor, department of mechanical engineering, shahrood branch, islamic azad university, shahrood, iran e. nikpanje department of chemistry, sciences faculty, north tehran branch, islamic azad university, north tehran, iran.

one way to increase the heat transfer is to use perforated twisted tapes with different hole diameters, which largely improve heat transfer with an increase in the heat transfer area at the constant volume and more mixed flow. in the previous studies, the effect of nanofluids with perforated twisted tapes is less studied. in this work, the performance of water / iron oxide nanofluid in a double...

2006
S. Basu B. M. Cetegen

An integral analysis of hydrodynamics and heat transfer in a thin liquid film flowing over a rotating disk surface is presented for both constant temperature and constant heat flux boundary conditions. The model is found to capture the correct trends of the liquid film thickness variation over the disk surface and compare reasonably well with experimental results over the range of Reynolds and ...

Entropy generation of double diffusive natural convection in a three dimensional differentially heated enclosure has been performed numerically. Vertical walls of enclosure are heated differentially and remaining walls are adiabatic. The obtained results were presented via iso-concentration, iso-temperatures, velocity vector projection, particle trajectories, velocity profiles, iso-entropy, loc...

Journal: :Indian Scientific Journal Of Research In Engineering And Management 2022

This paper is based on the numerical investigation of natural convection two vertical enclosure square and triangular cavity with air filled. The consist adiabatic hot cold wall wide range Rayleigh number from 103 to 106 aspect ratio 1 10 at interval 2.5. Flow patterns isotherm plots were used display results, for every case, local mean Nusselt values also produced. results show that an increas...

Journal: :journal of petroleum science and technology 2014
maryam jouyandeh mehdi moayed mohseni fariborz rashidi

a theoretical solution is presented for the forced convection heat transfer of a viscoelastic fluid obeying the giesekus constitutive equation in a concentric annulus under steady state, laminar, and purely tangential flow. a relative rotational motion exists between the inner and the outer cylinders, which induces the flow. a constant temperature was set in both cylinders, in this study. the f...

حاج زمان, رضا, رحمتی, احمدرضا,

In this study, for the first time natural convection heat transfer of Al2O3-water nanofluid with constant and variable properties is investigated within square shape porous media using the lattice Boltzmann method. The horizontal walls of the cavity are insulated, and left and right vertical walls are hot and cold, respectively. The Study have been carried out for Rayleigh numbers of 103, 10...

Journal: :transport phenomena in nano and micro scales 2015
r. aghayari h. maddah z. sharifnezhad a. hakiminejad s. sarli

nanofluid is a new class of heat transfer fluids engineered by dispersing metallic or non-metallic nanoparticles with a typical size of less than 100 nm in the conventional heat transfer fluids.this article aims to investigate the overall and convection heat transfer coefficient and nusselt number of al2o3-water nanofluid flowing in a horizontal double pipe heat exchanger under turbulent flow (...

Journal: :iranian journal of science and technology transactions of mechanical engineering 2015
h. yazici m. akcay m. golcu m.f. koseoglu y. sekmen

heating and sudden cooling are among the most important processes affecting temper quality in the production period of tempered auto glass. in this study, heat transfer characteristics and cooling times during the sudden cooling process of tempered glass production have been experimentally investigated. flat glass with dimensions of 50x50x4 mm has been heated up to 680 ºc in the furnace and was...

Journal: :International Journal of Heat and Technology 2019

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