www.tjprc.org editor@tjprc.org EFFECT OF TEMPERATURE AND MULTIWALLED CARBON NANOTUBES CONCENTRATION ON THERMOPHYSICAL PROPERTIES OF WATER BASE NANOFLUID MOHIT THAKUR 1 , D. GANGACHARYULU 2 & GURPREET SINGH 3 1,3 Department of Mechanical Engineering, Chandigarh University, Gharuan, Punjab, India 2 Chemical Engineering Department, Thapar University, Patiala, Punjab, India ABSTRACT Nanofluids can be used as the heat transfer fluid due to itsexceptional thermal properties. The paper investigated the various thermophysical of MWCNT-water nanofluid, when dispersed in water at various temperatures and particle concentration. The nanofluids are prepared by two-step method with gum arabicused as a surfactant to provide strength to the nanoparticles in base fluid. The thermophysical properties were measured using different volume concentrations (0 – 0.8 vol. %) of nanoparticles at various temperatures (30°C to 70°C). KD2 Pro Thermal Property Analyser, Differential Scanning Calorimeter, KEM-DA 130N - Portable density meter, Brookfield LVDV-III ultra- programmable viscometer devices were used for the measurement of thermal conductivity, specific heat, density, viscosity respectively. The density, viscosity and thermal conductivityincreases as MWCNT’s concentrationincreases, on the other hand specific heat was found to decline with particle concentration. Similarly, the thermal conductivity and specific heat increases with a rise in temperature whereas the viscosity and density decreases. KEYWORDS: Thermo physical Properties, Nanofluids & MWCNT Received: Jun 09, 2017; Accepted: Jul 04, 2017; Published: Jul 18, 2017; Paper Id: IJMPERDAUG201716 INTRODUCTION The increase in demand is due to the over exploitation of energy resources leading to rise of advancement techniques in various thermal systems. The most vital component in any energy efficient machine is its thermal system and the heat transfer fluid used in it. The conventional heat transfer fluids like ethylene glycol and water possesses poor thermal properties when used for cooling and heating applications. Due to its poor thermal properties, an establishment of different heat transfer fluid [1] comprises of a base fluid and a dispersed phase. Nanofluids are the dispersed nanoparticles in the base fluid; it had drawn a lot of kindness as potential heat transfer fluids due to their high thermal conductivity than that of the base fluid [2]. An increase in the thermal conductivity of the solid particles when dispersed in the liquid mixture was first proposed by Maxwell [3]. These nanofluids possesses large thermal conductivity and long-time stability at low particle concentration. An enhancement of 20% in thermal conductivity was recorded by Lee et al. [4] when suspended CuO nanoparticles of 4% volume and 35-nm CuO particles in ethylene glycol. Over the years, we have been using numerous nanoparticles like Al 2 O 3 , CuO, Al, Cu, SiO 2 , carbon nanotubes etc. Among these various nanoparticles, carbon nanotubes (CNT) is a best choice due to its outstanding and exclusive properties like high thermal conductivity of 2000-3000 W/m-K and high aspect ratio [5]. Choi et al. [6] examined an increment of 160% in thermal conductivity, when 1% of carbon nanotubes are discharged in engine oil. Das et al. [7] performed an experiment in Original Article International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249-6890; ISSN (E): 2249-8001 Vol. 7, Issue 4, Aug 2017, 151-160 © TJPRC Pvt. Ltd