International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 |Feb -2017
p-ISSN: 2395-0072
www.irjet.net
Review Paper on Enhancement of Heat Transfer by Using Binary Nanofluids Mr. Tejas V. Kadam1, Dr. M. Afzal Bhat2 P.G. Student, Department of Mechanical Engineering, ICORE, Pune, Maharashtra, India1 Associate Professor, Department of Mechanical Engineering, ICORE, Pune, Maharashtra, India2 ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - There is increasing interest in the heat transfer enhancement by using different types of nanofluids. This paper covers the advances research in convection boiling and pool boiling, the working fluid used as nanofluids. The data available in the literature review in terms of CHF enhancements and degradations in the nucleate pool boiling. The all researcher are focus on the measuring a CHF enhancement by using different nanofluids in the base fluid. An experiment has conducted at various concentrations and different temperature ranges with different nanofluids, for the calculating a heat transfer rate and critical heat flux factor for water-based nanofluids. The entire researcher has confirmed the increasing a concentration of nanofluids in base fluids to enhancement of the heat transfer coefficient. The effects of nanofluids on size, shape and other parameter of boiling heat transfer and critical heat flux. The resents study of nanofluids, such as the preparation methods, stability of nanofluids, bubble dynamics in flow boiling with the aim of identifying the reasons for its enhancement and the demerits of nanofluids. Key Words: critical heat transfer, boiling heat transfer.
1. INTRODUCTION Boiling heat transfer (BHT) is used in several applications are heat exchangers, refrigeration, power generation, for cooling purpose such as nuclear reactors and high-power electronics components and industrial process. To enhance the BHT processes are essential for typical industrial application and previously more energy saving. To increasing, a heat-transfer processes and the reduction in energy losses are important work, particular with regarding to the prevailing energy crisis. Boiling is a very capable and accomplished mode of heat transfer, and it is use in various engineering application. One of them the most important application of boiling and evaporation is in distillation of seawater, which is becoming essential in some arid regions. Boiling with surfactant additives is generally an exceedingly complex process, and it is influence by a larger set of variables than the phase-change process of pure water. [7] Heat transfer enhancement is method to save energy in different engineering field processes. To use of surfactants or Š 2017, IRJET
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solid particles because of their higher thermal conductivity so it can use in conventional fluids, it has been consider for last some decades to enhancement in the heat transfer. There are some practical problems like sedimentation; pressure drop and fouling to increase research in industry for this technique is never really pick uped. In last some recent years the important advances research in nano-technology to overcome or reduce this problem by using different nanoparticles and producing nanoparticles in nanometer size ranges. Nanoparticles are in form of solid to make a different category of fluids, called nanofluids. Nanofluids are in the form of liquid position containing nanoparticles, which are smaller size such as a 100 nm. Thermal conductivity of nanofluids is significantly higher than that of the base liquids. These kinds of fluids are now of great development or research is not only improving the characteristics such as flow and deformation (rheological properties) and mass transfer but also modify the Boiling Heat Transfer rate of fluid. [10]
2. CHF ENHANCEMENT Several techniques discussed below to enhancement the Critical Heat Flux (CHF) and Boiling Heat Transfer (BHT) can be divide in the two different types are: 1.
Active Method
2.
Passive Method
In the Active Method they can required a external changes in the heater surface and the Passive Method has not required any external changes in the heater surface. In the Active Method they can providing a vibration to the heater surface because to removing the bubble from the heated surface of the heater so that ways the Active Method required an external energy. In the Passive Method they cannot required an external energy because they can be providing a coating of a porous layer because to increase the oxidization of heated surface. [8] A recent passive approach that has increased attraction worldwide is to create or generate a new fluid to mix solid nanoparticles in base fluid, distilled, or pure water called nanofluids. There are several materials available for the choice of the dispersed chemically stable nanoparticles metals such as Au, Ag and Cu and metal oxides such as ZrO2, Al2O3 and SiO2 and in the different form availability of a carbon such as graphite, fullerene and diamond. In the boiling test show, that the engineer used nanofluids as coolants to ISO 9001:2008 Certified Journal
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