نتایج جستجو برای: heat generationabsorption

تعداد نتایج: 202323  

Journal: :international journal of nanoscience and nanotechnology 2015
s. sabbaghi s. mehravar

the aim of this paper is to enhance thermal performance of a microchannel heat sink by using nanoencapsulated phase change material (nepcm) slurry as a cooling fluid instead of pure fluid. a threedimensional model of a circular channel using water slurry of nepcm was developed. the results show a significant reduction in the mean fluid temperature along the channel and heat sink wall temperatu...

Journal: :transport phenomena in nano and micro scales 2014
r. aghayeri h. maddah f. ashori m. aghili

in this work, the characteristics of flow and heat transfer of a fluid containing nano particles of aluminum oxide with the water volume fraction (0.1-0.2-0.3)(v/v) percent of the reports. the overall heat transfer coefficient, heat transfer and the average heat transfer fluid containing nano water - aluminum oxide in a horizontal double pipe counter flow heat exchanger under turbulent flow con...

Journal: :journal of heat and mass transfer research(jhmtr) 2014
seyed faramarz ranjbar mir hatef seyyedvalilu

helical coil heat exchangers are widely used in industrial applications ranging fromcryogenic processes, air-conditioning, and nuclear reactors to waste heat recovery due totheir compact size and high heat transfer coefficient. in this kind of heat exchangers, flowand heat transfer are complicated. this paper reports a numerical investigation of theinfluence of different parameters such as coil...

Journal: :international journal of energy and environmental engineering 2010
k javaherdeh h karimi

this study represents effect of four variables in performance of a heat-pump in two cities of tehran and rasht. a computer program has been developed, simulating a certain heat pump acting in different environments with different refrigerants in heating season. the analysis is based on a homogeneous model. effect of different refrigerants, depth of the buried heat exchangers and moisture conten...

Journal: :transport phenomena in nano and micro scales 0
b. raei department of chemical engineering, university of sistan and baluchestan, zahedan 98164-161, i. r.iran f. shahraki department of chemical engineering, university of sistan and baluchestan, zahedan 98164-161, i. r.iran m. jamialahmadi petroleum engineering department, petroleum university of technology, ahwaz, i. r. iran s.m. peyghambarzadeh department of chemical engineering, mahshahr branch, islamic azad university, mahshahr, i. r.iran

in this paper, overall heat transfer coefficient and friction factor of water based γ-al2o3 nanofluid in a double tube counter flow heat exchanger have been measured experimentally under turbulent flow condition. for better dispersion of γ-al2o3 nanoparticles in distilled water, magnetic stirrer and ultrasonic vibrator (with a power of 240 kw and frequency of 35 khz) were implemented. the stabi...

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: :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: :iranian biomedical journal 0
سعید بوذری saeid bouzari مانا علومی mana oloomi علی هاتف سلمانیان ali hatef salmaninan انیس جعفری anis jafati

elaboration of different toxins by enterotoxigenic e. coli has been considered as one of the main virulence factors contributing to the manifestation of disease caused by these microorganisms. various strategies have been employed to raise antibodies against these toxins as a line of defense. in this study, the 3’ terminus of the gene that codes for the binding subunit of the heat-labile entero...

Journal: :مکانیک سیالات و آیرودینامیک 0
نازیلا خانی حسام الدین ابن الدین حمیدی

in this paper by the introduction of the basic equipment of a solar cooling system, solar hydrogen ammonia refrigeration system as a solar cooling technique will be discussed. using heat collector and absorption refrigeration allows us to use residual heat, for cooling, heating and producing hot water and boiling water .this research focuses on methods of heat transfer from the sun into the gen...

1999
Gordon Skorstad

Choosing between multiple ontological perspectives is crucial for reasoning about the physical world. Choosing the wrong perspective can make a reasoning task impossible. This paper introduces a Lagrangian plug flow ontology (PF) for reasoning about thermodynamic fluid flow. We show that this ontology captures continuously changing behaviors of flowing fluids not represented in currently implem...

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