Enhancing thermal conductivity of fluids with nano-particles
01 Jan 1995-Vol. 231, pp 99-105
About: The article was published on 1995-01-01 and is currently open access. It has received 7263 citations till now. The article focuses on the topics: Thermal conductivity & Nanoparticle.
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TL;DR: In this article, the impacts of Joule heating and nonlinear radiation in mixed convective flow of Walter-B liquid are addressed and the governing mathematical problems are tackled via homotopic procedure.
87 citations
TL;DR: In this article, a study of heat transfer performance of water, ethylene glycol (EG) and their mixtures of varying compositions and comparison thereof is presented. And the results show an enhancement in heat transfer coefficient with increased volume fraction of TiO 2 nanoparticles.
Abstract: This paper presents a study of heat transfer performance of water, ethylene glycol (EG) and their mixtures of varying compositions and comparison thereof. The present work demonstrates the enhancement in convective heat transfer in nanofluids. The nanofluids were prepared by adding TiO 2 nanoparticles (having a particle size below 100 nm) in a base fluid. A binary mixture of EG (40%) and water (60%) was used as a base fluid. Nanofluids with varied volume fraction between 0 and 0.5 (volume fraction of TiO 2 nanoparticles) were considered in the present study. The experimental setup used was consisting of a test section that includes 750 mm long copper pipe with 8 mm inner diameter and a heater. The test section was covered with an insulation layer to minimize the heat losses. Temperature measurement was done with thermocouples. The experiments were conducted to study the effects of solid volume fraction, nanofluid flow rate and the inlet temperature on the heat transfer performance of the nanofluids. The results show an enhancement in heat transfer coefficient with increased volume fraction of TiO 2 nanoparticles. The maximum enhancement of 105% in heat transfer coefficient was observed for the nanofluid with solid volume fraction of 0.5.
87 citations
TL;DR: In this article, the results of thermal conductivity and viscosity showed an enhancement of 0.5-20% and 0.4-60% compared with the base fluid.
Abstract: Solid particles dispersed in a liquid with sizes no larger than 100nm, known as nanofluids, are used to enhance Thermophysical properties compared to the base fluid.
Preparations of alumina (Al2O3), titania (TiO2) and silica (SiO2) in water have been experimentally conducted in volume concentrations ranging between 1 and 2.5%.
Thermal conductivity is measured by the hot wire method and viscosity with viscometer equipment. The results of thermal conductivity and viscosity showed an enhancement
(0.5–20% and 0.5–60% respectively) compared with the base fluid. The data measured agreed with experimental data of other researchers with deviation of less than 5%. The
study showed that alumina has the highest thermal conductivity, followed silica and titania, on the other hand silica has the highest viscosity followed alumina and titania.
87 citations
87 citations
TL;DR: In this article, the authors examined the effect of thermal radiation on the thermal boundary layer thickness of an exponentially stretching surface saturated by nanofluids and showed that the thermal layer thickness significantly increases with the increase of Brownian motion, thermophoresis number and magnetic field strength.
87 citations