International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
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Hair Pin Heat Exchanger Layered with Graphene in Tube Side Using Al2O3 as Nanofluid Tauseef Yazdani, Shashi Kumar Jain2, Ankit Goyal3 1MTech
student, Dept. of Mechanical Engineering, Technocrats Institute of Technology & Science, Bhopal, MP, India 2Professor, Dept. of Mechanical Engineering, Technocrats Institute of Technology & Science, Bhopal, MP, India 3Professor, Dept. of Mechanical Engineering, Technocrats Institute of Technology & Science, Bhopal, MP, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - A well-designed heat exchanger improves the
Blending of solid particles in the base liquid is a method to increase rate of heat transfer. As metal have higher thermal conductivity than liquids, suspending solid particles into the base fluid is relied upon to upgrade the thermal conductivity of that liquid. The upgrade of thermal conductivity of normal liquids by the suspension of solid particles, similar to millimetre or micrometre sized particles, has been notable for quite some time.
effectiveness of the heat exchanger. A hairpin heat exchanger resembles a hairpin when a shell-and-tube heat exchanger with a single-pass unit is folded in half, which can be used where space is a constraint. Design, CFD analysis and evaluation of various parameters of hairpin heat exchanger with graphene layer and its comparison with hairpin heat exchanger without graphene layer is the main aim of this paper. The heat exchanger is modified with the addition of a graphene layer on both the side (inner and outer side) of the tube of the heat exchanger. Graphene is an allotropic form of carbon having a single layer of atoms distributed in a 2-D honeycomb lattice. The coefficient of thermal conductivity of graphene is very high as compared to other materials. In addition to it, nanofluid Al2O3 is introduced as cold fluid. Nanofluids are colloidal suspensions made of nanoparticles in some base fluid. ANSYS FLUENT 2020 has been used to model the geometry and to perform numerical simulation. Turbulent flow conditions were used to analyse the heat exchanger. CFD analysis has been done on hairpin heat exchangers using graphene layer. The results indicate that the high thermal conductivity of graphene increases rate of heat transfer, and the numerical value of convective heat transfer coefficient is also high.
Experiments were conducted to increase the heat transfer in laminar and turbulent flow of different compositions of glycol blended in with water in a double tube hair pin heat exchanger. Acquired outcomes showed that the heat transfer coefficient of the blend of ethylene glycol and water increment with Reynolds number and ethylene glycol concentration [1]. Various investigations show that nanofluids will improve rate of heat transfer because of their higher thermal conductivity than base fluids [2-5]. Many researchers focused to increase the convection characteristics by considering different parameters like addition of nanoparticles, pipe cross-sectional area, materials, the concentration of nanofluid, and flow conditions [6-11]. A study was conducted on the specific heat of ethylene glycol, Al2O3 and water (EG/W) nanofluid and its outcome on the cogeneration efficiency of a 45-kW diesel electrical generator (DEG) shows that the productivity of waste heat recovery within the device was augmented because of the higher convective heat transfer coefficient of the nanofluids [12]. The experiments were done to analyze the feasibility of Al2O3/water nanofluid in an air-cooled heat exchanger. Results show that Al2O3/water nanofluid has better heat transfer rate than water [13]. CFD examination on hair pin heat exchanger using Al2O3 and TiC nanofluids blended in with base fluid independently at 0.6 and 0.7 percent volume fraction affirm that TiC is the reasonable fluid at 0.6 percent volume part inside the hair pin heat exchanger for a superior rate of heat transfer [14].
Key Words: Hair pin heat exchanger, Graphene, Nanofluid, Thermal analysis, Convective heat transfer coefficient.
1. INTRODUCTION The increase of convective heat transfer coefficient is one of the foremost vital technical aims for industrial appliances used in heat transfer applications. A hairpin heat exchanger resembles a hairpin when a shell-and-tube heat exchanger with a single-pass unit is folded in half. Unlike multi-pass heat exchangers (multiple passes on the tube side), hairpin heat exchangers have the peculiarity that the shell side stream circulates countercurrent to the tube side flow, in all passes. water, glycol, and engine oil are conventional fluids normally used for heat transfer. Various procedures are applied to help the heat transfer since low heat transfer coefficient of these ordinary fluids hinders the improvement in performance and the compactness of heat exchangers.
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Aluminum graphene nanoplatelet composites were fabricated by the stir casting method to increase the mechanical properties of aluminum. [15]. Heat transfer in condenser tank using Al2O3- DI water Nanofluids was analyzed in this experiment, and it was observed that nanofluid enhances the heat transfer and the convective heat transfer coefficient [16].
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