نتایج جستجو برای: rayleighbenard convection

تعداد نتایج: 26494  

Journal: :تحقیقات مهندسی کشاورزی 0
نیکروز باقری دانشجوی سابق کارشناسی ارشد علیرضا کیهانی دانشیار گروه مکانیک ماشین های کشاورزی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران سید سعید محتسبی استاد گروه مکانیک ماشین های کشاورزی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران رضا علیمرانی دانشیار گروه مکانیک ماشین های کشاورزی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران

monitoring the effective parameters of drying crops is necessary to evaluate and determine system performance under real conditions. hence, a monitoring system was constructed to determine the performance of a vegetation forced-convection solar dryer. digital temperature sensors were set up in the air inlet and outlet of the collector and the air outlet of the drying chamber. a program was writ...

Journal: :transport phenomena in nano and micro scales 2014
m. jafari m. farhadi k. sedighi

the effects of single walled carbon nanotube (swcnt) on mixed convection in a cavity are investigated numerically. the problem is studied for different richardson numbers (0.1-10), volume fractions of nanotubes (0-1%), and aspect ratio of the cavity (0.5-2.5) when the grashof number is equal to 103. the volume fraction of added nanotubes to water as base fluid are lowers than 1% to make dilute ...

Journal: :transport phenomena in nano and micro scales 2015
a. aghaei g.a. sheikhzadeh h.r. ehteram m. hajiahmadi

natural convection heat transfer has many applications in different fields of industry; such as cooling industries, electronic transformer devices and ventilation equipment; due to simple process, economic advantage, low noise and renewed retrieval. recently, heat transfer of nanofluids have been considered because of higher thermal conductivity coefficient compared with those of ordinary fluid...

Journal: :جغرافیا و توسعه ناحیه ای 0
مشکواتی مشکواتی مزرعه فراهانی مزرعه فراهانی قندهاری قندهاری جعفری جعفری

due to its complexity and destructive nature, convection has been subject of many studies and researches among weather phenomena throughout the world. scientists have attempted for decades to generate different types of models to provide the possibility of abating or, at least, reducing convective weather phenomena effects on people’s lives. in south or southwest of iran, people are familiar wi...

Abdolreza Gandjalikhan Nassab Maryam Moein Addini

This paper presents a numerical investigation of the laminar mixed convection flow of a radiating gas in an inclined lid-driven cavity. The fluid is treated as a gray, absorbing, emitting, and scattering medium. The governing differential equations including continuity, momentum and energy are solved numerically by the computational fluid dynamics techniques (CFD) to obtain the velocity and tem...

A. Aghaei G.A. Sheikhzadeh H.R. Ehteram M. Hajiahmadi

Natural convection heat transfer has many applications in different fields of industry; such as cooling industries, electronic transformer devices and ventilation equipment; due to simple process, economic advantage, low noise and renewed retrieval. Recently, heat transfer of nanofluids have been considered because of higher thermal conductivity coefficient compared with those of ordinary fluid...

In this study, the unsteady double-diffusive mixed convection in the one and two-sided lid-driven cavities are studied and compared together using numerical SIMPLE algorithm. Uniform but different temperatures and mass concentrations are assumed at horizontal walls. The used fluid (pure air) was assumed incompressible and Newtonian. The used numerical method is firstly validated against previou...

2005
R. M. Doherty D. S. Stevenson W. J. Collins M. G. Sanderson

The impact of convection on tropospheric O3 and its precursors has been examined in a coupled chemistryclimate model. There are two ways that convection affects O3. First, convection affects O3 by vertical mixing of O3 itself. Convection lifts lower tropospheric air to regions where the O3 lifetime is longer, whilst mass-balance subsidence mixes O3-rich upper tropospheric (UT) air downwards to ...

2015
A. V. Yudin

It is shown that the unusual thermodynamic properties of matter within the region of two-phase coexistence in hybrid stars result in a change of the standard condition for beginning of convection. In particular, the thermal flux transported by convection may be directed towards the stellar center. We discuss favorable circumstances leading to such an effect of “inverse convection” and its possi...

2000
Matthias Steffen

The dynamics and thermal structure of the surface layers of stars with outer convection zones can be studied in some detail by means of numerical simulations of time-dependent compressible convection. In an effort to investigate the properties of “stellar granulation” as a function of spectral type, we have carried out elaborate 2-dimensional radiation hydrodynamics calculations of surface conv...

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