Experimental Investigation on Thermal Characteristics of Heat Pipes Using Water-based MWCNT Nanofluids

Ha, Hyo Jun; Kong, Yu Chan; Hyung, Kyu; Jang, Seok Pil

doi:10.6110/kjacr.2011.23.7.528

Korean Journal of Air-Conditioning and Refrigeration Engineerin

2011

DOI: 10.6110/kjacr.2011.23.7.528

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Experimental Investigation on Thermal Characteristics of Heat Pipes Using Water-based MWCNT Nanofluids

Hyo Jun Ha¹,

Yu Chan Kong²,

Kyu Hyung³

et al.

Abstract: In this paper, thermal characteristics of cylindrical grooved wick heat pipes with water-based MWCNT nanofluids as working medium are experimentally investigated. Volume fractions of nanoparticles are varied with 0.1% to 0.5%. Transient hot wire method developed in house is used to measure the thermal conductivity of nanofluids. It is enhanced by up to 29% compared to that of DI water. The thermal resistances and temperature distributions at the surface of the heat pipes are measured at the same evaporation te… Show more

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Cited by 4 publications

References 17 publications

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Preparation and Characteristics of Fluorinated Carbon Nanotube Applied Capacitive Desalination Electrode with Low Energy Consumption

Yoo¹,

Kang²,

Park³

et al. 2016

Applied Chemistry for Engineering

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The surface of carbon nanotubes (CNTs) was modified by fluorination and applied to conductive materials to improve the energy efficiency of a capacitive desalination (CDI) electrode. CNTs were fluorinated at room temperature with a mixed gas of fluorine and nitrogen, and activated carbon based CDI electrodes were then prepared by adding 0-0.5 wt% of untreated CNTs or fluorinated CNTs with respect to the activated carbon. Fluorinated CNTs showed improved dispersibility in the electrode and also slurry as compared to untreated CNTs, which was confirmed by the zeta potential and scanning electron microscopy. Fluorinated CNTs added electrodes showed higher desalination efficiency but lower energy consumption than those of using untreated CNTs added electrodes. This was attributed to the decrease in the resistance of CDI electrodes due to the improved dispersibility of CNTs by fluorination.

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Preparation and Characteristics of Fluorinated Carbon Nanotube Applied Capacitive Desalination Electrode with Low Energy Consumption

Yoo¹,

Kang²,

Park³

et al. 2016

Applied Chemistry for Engineering

View full text Add to dashboard Cite

show abstract

Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2011

Han¹,

Lee²,

Kim³

et al. 2012

Korean Journal of Air-Conditioning and Refrigeration Engineerin

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This article reviews the papers published in the Korean Journal of AirConditioning and Refrigeration Engineering during 2011. It is intended to understand the status of current research in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities. Conclusions are as follows. (1) Research trends of thermal and fluid engineering have been surveyed as groups of fluid machinery and fluid flow, thermodynamic cycle, and new and renewable energy. Various topics were presented in the field of fluid machinery and fluid flow. Research issues mainly focused on the rankine cycle in the field of thermodynamic cycle. In the new and renewable energy area, researches were presented on geothermal energy, fuel cell, biogas, reformer, solar water heating system, and metane hydration. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics, pool boiling and condensing heat transfer, nanofluids and industrial heat exchangers. Researches on heat transfer characteristics included heat transfer above liquid helium surface in a cryostat, methane hydrate formation, heat and mass transfer in a liquid desiccant dehumidifier, thermoelectric air-cooling system, heat transfer in multiple slot impinging jet, and heat transfer enhancement by protrusion-in-dimples. In the area of pool boiling and condensing heat transfer, researches on pool boiling of water in low-fin and turbo-B surfaces, pool boiling of R245a, convective boiling two-phase flow in trapezoidal microchannels, condensing of FC-72 on pin-finned surfaces, and natural circulation vertical evaporator were actively performed. In the area of nanofluids, thermal characteristics of heat pipes using water-based MWCNT nanofluids and the thermal conductivity and viscosity were measured. In the area of industrial heat exchangers, researches on fin-tube heat exchangers for waste gas heat recovery and Chevron type plate heat exchanger were implemented.

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Study on the Thermal Conductivity and Viscosity of Ethanol with Carbon Nanotubes for the Development of a Heat Pipe Working Fluid

An¹,

Park²,

Park³

et al. 2012

Journal of the Korean Solar Energy Society

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r) , * * * 서정대학교 소방안전관리과(k i mj y @s e o j e o n g. a c. k r) * † 제주대학교 에너지공학과(j n k i m@j e j u n u. a c. k r) * De p t .o fE n e r g yE n g i n e e r i n g ,J e j uNa t i o n a lUn i v e r s i t y (a n e j 5 1 5 @j e j u n u. a c. k r ,p s s 5 1 5 3 @j e j u n u. a c. k r) * * De p t .o fMe c h a n i c a lE n g i n e e r i n g ,J e j uNa t i o n a lUn i v e r s i t y (y c p a r k @j e j u n u. a c. k r) * * * De p t .o fF i r eS a f e t yMa n a g e me n t ,S e o j e o n gC o l l e g e (k i mj y @s e o j e o n g. a c. k r) * † De p t .o fE n e r g yE n g i n e e r i n g ,J e j uNa t i o n a lUn i v e r s i t y (j n k i m@j e j u n u. a c. k r) A b s t r a c t Na n o f l u i d su s i n g C a r b o n Na n o t u b e sh a v ea e x c e l l e n tt h e r ma lc h a r a c t e r i s t i c .I n t h i ss t u d y ,f o ri n c r e a s i n g t h e e f f i c i e n c y o fs o l a rc o l l e c t o r ,t h et h e r ma lc o n d u c t i v i t y a n d v i s c o s i t y o fE t h a n o l-Ox i d i z e d Mu l t i-wa l l e d C a r b o n Na n o f l u i d swe r eme a s u r e d. Na n o f l u i d swe r ema n u f a c t u r e db yu l t r as o n i cd i s p e r s i n gOx i d i z e dMu l t i-wa l l e dC a r b o n Na n o t u b e s (OMWC NTs)i ne t h a n o la tt h er a t e so f0. 0 0 0 5∼ 0. 1v o l %.Th et h e r ma lc o n d u c t i v i t ya n dv i s c o s i t yo f ma n u f a c t u r e dn a n o f l u i d swe r eme a s u r e da tt h el o w t e mp e r a t u r e (1 0 ℃) ,t h er o o m t e mp e r a t u r e (2 5 ℃)a n dt h eh i g h t e mp e r a t u r e (7 0 ℃) .F o rme a s u r i n g t h e r ma lc o n d u c t i v i t y a n d v i s c o s i t y ,weu s e d t r a n s i e n th o t-wi r eme t h o d a n d r o t a t i o n a l d i g i t a l v i s c o me t e r , r e s p e c t i v e l y. Asar e s u l t , u n d e rg i v e nt e mp e r a t u r ec o n d i t i o n s , t h e r ma l c o n d u c t i v i t yo f t h e0. 1v o l % n a n o f u i d si mp r o v e d3 3. 7 4 % (1 0 ℃) , 3 3. 1 4 % (2 5 ℃)a n d3 2. 3 6 % (7 0 ℃) ,a n di t sv i s c o s i t yi n c r e a s e db y 3 7. 9 3 % (1 0 ℃) ,3 1. 9 2 % (2 5 ℃)a n d2 9. 4 2 % (7 0 ℃)t h a nt h eb a s ef l u i d s. Ke y wo r d s :산화 다중벽 탄소나노튜브(Ox i d i z e d Mu l t i-wa l l e d Na n o t u b e s) ,에탄올(E t h a n o l) ,열전도도(Th e r ma l c o n d u c t i v i t y) ,점도(Vi s c o s i t y) ,태양열 집열기(S o l a rC o l l e c t o r) ,히트파이프(He a tP i p e)

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Experimental Investigation on Thermal Characteristics of Heat Pipes Using Water-based MWCNT Nanofluids

Cited by 4 publications

References 17 publications

Preparation and Characteristics of Fluorinated Carbon Nanotube Applied Capacitive Desalination Electrode with Low Energy Consumption

Preparation and Characteristics of Fluorinated Carbon Nanotube Applied Capacitive Desalination Electrode with Low Energy Consumption

Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2011

Study on the Thermal Conductivity and Viscosity of Ethanol with Carbon Nanotubes for the Development of a Heat Pipe Working Fluid

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