نتایج جستجو برای: Total heat flux

تعداد نتایج: 1060876  

Heat transfer coefficient in nucleate pool boiling near critical heat flux at least one orderhigher than the convectional heat transfer modes. In this paper, an experimental setup isdesigned and fabricated to investigate the mechanism of heat transfer from boiling surface tobulk liquid near critical heat flux. The images of pool boiling near the high heat flux regionreveals that the individual ...

Journal: :international journal of nanoscience and nanotechnology 2011
s. zeinali heris taofik h. nassan nassan s. h. noie

sometimes the need for non-circular ducts arises in many heat transfer applications because of lower pressure drop of non-circular cross section such as square duct compared to circular tube, particularly in compact heat. but square cross section has poor heat transfer performance and it is expected that using a nanofluid as a new heat transfer media may improve the heat transfer performance of...

2014
Shigeru Koyama Donghwi Kim Ken Kuwahara Chieko Kondo Dong-Hwi KIM Ken KUWAHARA Chieko KONDO

This paper deals with an experimental study on the frosting phenomena using a fin bundle, which is an expanded model for the fins of the heat exchanger. The overall characteristics such as total frost mass, mass flux, pressure drop, sensible and latent heat fluxes and the local characteristics such as local temperature, local heat flux and local frost thickness were investigated under several e...

Journal: :international journal of geo science and environmental planning 0
seyed amirodin sadrnejhad prof, civil engineering dept., k.n.toosi university of technology, teheran, iran mir sina mousavi aghdam msc,khak energy pars., geotechnical consultant co, teheran, iran mahsa memarianfard phd civil engineering dept., k.n.toosi university of technology, teheran, iran zahra sharif tehrani msc student.faculty of art and architecture. kashan university, kashan, iran

an investigation on the thermal performance of the soil as geothermal heat energy storage medium has been conducted. the thermal characteristics of the soil storage and the heat transfer from a heat exchanger in the soil, surrounding and bottom surface will be discussed. this investigation forms a contribution to a project to realize such storage to be charged from a solar heating system. this ...

Journal: :فصلنامه علمی پژوهشی مهندسی مکانیک جامدات واحد خمینی شهر 0
mohammad hossaini assistant professor, department of mechanical engineering, sirjan university of technology, sirjan, iran meisam khaloei m.sc., department of mechanical engineering, sirjan branch, islamic azad university, sirjan, iran abbas zandi baghche maryam m.sc., department of mechanical engineering, sirjan university of technology, sirjan, iran

in this paper the numerical analysis of flow and time dependent heat transfer of micro-tube conveying nanofluid in laminar flow is investigated. in this study, convection heat transfer of nanofluid and base fluid and transient analysis for time-varying heat flux for time step of 0.0001 second are elucidated. it is observed that the pumping power of nanofluid flowing and the maximum temperature ...

Journal: :journal of modern processes in manufacturing and production 0
mahmoud moradi department of mechanical engineering, faculty of engineering, malayer university, malayer, iran majid ghoreishi faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran azam rahmani faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran

in this paper, a three-dimensional finite element model has been developed to simulate the laser-tig hybrid welding (hlaw) of stainless steel 1.4418 with thickness of 4 mm. transient temperature profile and dimensions of the fusion zone and heat affected zone (haz) during welding process are calculatedusing finite element method (fem) and were solved in the abaqus/standard software.the heat sou...

2012
Yisheng Rong Jian Sun Weiqiang Liu Renjun Zhan

A CFD study on heat flux reduction in hypersonic flow with opposing jet has been conducted. Flowfield parameters, reattachment point position, surface pressure distributions and heat flux distributions are obtained and validated with experiments. The physical mechanism of heat reduction has been analyzed. When the opposing jet blows, the freestream is blocked off, flows to the edges and not int...

A Al-Khazraji S.A Amin S.M Ali,

The present paper deals with the design of experimental work matrices for two groups of experiments by using Response surface methodology (RSM). The first EDM group was dealt with the use of kerosene dielectric alone, while the second was treated by adding the graphite micro powders mixing to dielectric fluid (PMEDM). The total heat flux generated and fatigue lives after EDM and PMEDM models we...

Journal: :علوم و تکنولوژی پلیمر 0
سعید بختیاری لیلا تقی اکبری

fire behavior of different types of eps was evaluated with the use of iso 5660 cone calorimeter test method. considering the complexity of behavior of eps against high temperatures, several specimens were tested, so a betterjudgment on fire behavior of this material could be acquired. the effects of foam density, thickness of specimens and the level of heat flux on fire behavior of foam were ex...

2002
NEIL F. LAIRD DAVID A. R. KRISTOVICH

An investigation of sensible and latent heat fluxes and their relation to synoptic weather events was performed using hourly meteorological measurements from National Data Buoy Center buoy 45003, located in northern Lake Huron, during April–November of 1984. Two temporal heat flux regimes were found to exist over Lake Huron. The first period extended from April through July and was characterize...

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