Nguyen experimentally investigated the heat transfer in phe and reported an enhancement in the heat transfer rates 7, pantzali et al also studied the effects using cuo nano fluids in the similar apparatus, both experimentally and numerically, and. Experimental analysis of heat transfer rate in corrugated. Numerical analysis, heat exchanger, heat transfer, friction factor, enhancement. Research article heat transfer of nanofluid in a double pipe heat exchanger rezaaghayari, 1 heydarmaddah, 2 malihezarei, 1 mehdidehghani, 3 andsaharghanbarikaskarimahalle 4 department of chemical engineering, shahrood branch, islamic azad university, shahrood, iran. Heat transfer enhancement using cuo water nanofluid in a shell. Designing and application of a shell and tube heat exchanger for. Heat exchanger thermalhydraulic design procedures top in involve exchanger rating quantitative heat transfer and pressure drop evaluationandor exchanger sizing. Applications of nanofluid for heat transfer enhancement explores recent progress in computational fluid dynamic and nonlinear science and its applications to nanofluid flow and heat transfer. There are active and passive methods which can be employed to enhance the rate of heat transfer without reducing the general efficiency of the energy conservation systems. The present work reported the use of variant twisted tapes fitted in a double pipe heat exchanger to improve the fluid mixing that leads to higher heat transfer rate with respect to that of the plaintwisted tape. Due to the limitation of fossil fuels, shortage of energy, optimization of energy consumption in various industrial processes becomes very important and challenging issue all over the world. Intensification of heat transfer increases proportionally with increasing of volume. Experimental investigation of plate heat exchanger using. Pdf analysis of a double pipe heat exchanger performance.
Cfd, cross flow, heat exchanger, integral fin, heat transfer coefficient. Application of nanofluids in thermal design of compact. Nanofluids have higher thermal conductivity and singlephase heat transfer coefficients than their base fluids. Experimental study of exergetic performance of al 2 o 3 nanofluid in a double. Li and xuan 6, xuan and li 7 and pak and cho 8 experimentally measured the convection heat transfer and pressure drop for nanofluid tube flows. Deore 1pg student,2pg student,3head of the department 1sad vidyamandal institute of technology, bharuch392001, gujarat,india 1sunny. Nanofluid is a new class of engineering fluid that has good heat transfer characteristics which is essential to increase the heat transfer performance in various. These nanoparticles, and structures and devices comprised of them, display unique mechanical, optical, electrical, and magnetic properties that differ radically from.
In this work a model of finned tube heat exchanger was made and by using ansys fluent and used al2o3 nanofluid as cooant for heat transfer enhancement. Heat transfer in crossflow heat exchangers for application. Heat exchanger theory the study of heat and heat transfer has a long history. The plate heat exchanger was a small, particularly manufactured model of common home radiators, 40 cm in height and 60 cm in length, exchanging heat freely with the ambience through four fins.
However, conventional applications of nanofluids are restricted to nonfood. Pdf this article reports an experimental study on the forced convective heat transfer and flow characteristics of a nanofluid consisting of water. It has been well established that applications of nanofluids in shell and tube heat exchangers are a competitive alternative for common industrial fluids such as hot water. Later, brinkman 1952 presented a viscosity correlation eq. A reduction in energy consumption is possible by enhancing. Understanding heat exchangers, cross flow counter flow and. A plate heat exchanger consists of a series of thin and corrugated plates. Pdf heat transfer augmentation in heat exchanger using. The performance is discussed in terms of heat transfer coefficient ratio. Effectiveness and overall heat transfer coefficient o. Heat transfer analysis of a shell and tube heat exchanger operated.
One of the most commonly used types of heat exchangers is the shell and tube heat exchanger. However, a good understanding of the underlying principles of exchanger design is needed to use this software effectively. The heat transfer depends not solely on the transfer of heat energy, but also to predict the heat exchange rate, that take place under certain specified conditions. Vinutha3 1,2,3mechanical engineering, sitam abstractin this project studying of double pipe heat exchange type in which the inner and annualar tubes are made of gi and ss304 materials respectively. I interviewed at heat exchanger design indianapolis, in in february 2015. The plate heat exchanger has 40 cm in height and 60 cm in length. Typical nanoparticles are made of metals, oxides or.
Abstractthe present work is a numerical simulation of nanofluids flow in a double pipe heat exchanger provided with porous baffles. Heat transfer enhancement of nanofluids sciencedirect. The forced convective heat transfer coefficient of the nanofluids using theoretical correlations also calculated in order to compare the results with the. Pdf effect of nanofluid on heat transfer characteristics of double. The al 2 o 3 nanoparticles of about 30 nm diameter are used in the. Efficiencies of various liquid coolants depend on the fluid properties and the flow mode laminar or turbulent and can be estimated from the fluid dynamics equations 16. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid. Experimental research on heat transfer characteristics of cuo. To enhance heat exchange under high temperature condition and get the more accurate data, we try to improve the traditional experimental apparatus which is used to test nanofluid heat. The main focus of using nanofluid is that it has high thermal conductivity than base fluid like water, ethylene glycol, etc.
The inner pipe of the double pipe heat exchanger was made of copper, 12 mm in diameter and 1 mm in thickness, with a heat exchange length of 70 cm. Cfd analysis on double pipe heat exchanger using fe 3 o 4 nano fluid g. Heat transfer enhancement in shell and tube heat exchanger by. Heat transfer enhancement in shell and tube heat exchanger. Heat transfer enhancement by using zno water nanofluid in a. Keywords zno nanofluid, heat transfer in nanofluid, concentric tube heat exchanger i.
Introduction a heat exchanger is the equipment built to efficiently transfer heat from one medium to. Figure 3 shows that the effectiveness of heat exchangers varied from 61 % to 68%. Performance evaluation on an aircooled heat exchanger for. Engineering nanofluids for heat transfer applications. The test loop included a heat transfer section, a nanofluid reservoir tank, a water reservoir tank, two pumps for nanofluid and cooling water, and two needle valves for controlling the flow rate, a plate heat exchanger and a pressure drop measuring unit. The term heat exchanger applies to all equipment used to transfer heat between two streams. Al 2 o 3 with a particle size of 20 nm and volume fraction of 0. Applications of nanofluid for heat transfer enhancement 1st.
Application of nanoparticles provides an effective way of improving heat transfer characteristics of fluids eastman et al. The experiments are conducted in the heat exchanger for different concentrations of nanoparticles and reynolds numbers. Pdf heat transfer through heat exchanger using al2o3 nanofluid. This results in an increase in ntu of the heat exchanger. Application of nanofluids in heat transfer intechopen. Higher temperatures may be reached with special gasket and adhesive materials. Effectiveness and overall heat transfer coefficient o water.
The experimental sample was al 2 o 3 water nanofluid produced by the direct synthesis method at three different concentrations 0. Designing and application of a shell and tube heat. Heat transfer and pressure drop characteristics of a plate heat. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Less than 7 mins, i waited at least 3 of those 7 mins. The principle of air streams passing each other counterflow is applied to the space created. The opening chapters explain governing equations and then move on to discussions of free and forced convection heat transfers of nanofluids. Nanoparticles can be produced from several processes such as gas condensation, mechanical attrition or chemical precipitation techniques. The same happened with the oveall heat transfer coefficient heat transfer rate is proportional to nanofluid mass flow rate as shown in shown in fig.
Secondly, this paper defines graphene nanofluids as beneficiary fluids, the heat. Review of literature on heat transfer enhancement in heat. Effect of particle size on the convective heat transfer in nanofluid by anoop et al. Effects of temperature and concentration of nanoparticles on nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter turbulent flow are. Forced convective heat transfer studies have been carried out in an agitated shell and helical coil heat exchanger using cuowater nanofluid. So, the goal of this research was to introduce nanofluid technology for thermal processing of food products, increasing heat transfer efficiency in. Combination of nanofluid and inserts for heat transfer. This article explains the basics of exchanger thermal design, covering such topics as. Convective transport in nanofluids journal of heat. Also overall heat transfer coefficient of cuwater was highest as 23% followed by al 2 o 3 with 21% compared to pure water.
Application of nanofluids in heat transfer 415 where eff is the effective viscosity of nanofluid, bf is the base fluid viscosity, and is the volume fraction of the suspended particles. Among these methods, passive techniques are more costeffective and reliable. Cfd analysis on double pipe heat exchanger using fe3o4 nano fluid. The hot nanofluid flows in the inner cylinder, whereas the cold nanofluid circulates in the annular gap. Heat transfer of nanofluid in a double pipe heat exchanger article pdf available in international scholarly research notices 2014 november 2014 with 1,220 reads how we measure reads. The nanofluid is an emerging area of research and has lot of potential in heat transfer applications. Heat transfer of nanofluids in a shell and tube heat exchanger. The addition of solid particles into heat transfer media has long been known as one of the useful techniques for enhancing heat transfer, although a major consideration when using suspended millimeter or micrometersized particles is that they have the potential to cause some severe problems, such as abrasion, clogging, high pressure drop, and sedimentation of particles. Design and development of shell and tube heat exchanger for. This article reports an experimental study on the forced convective heat transfer and flow characteristics of a nanofluid consisting of water and different volume concentrations of al 2 o 3 nanofluid 0.
Two of the simplest and most important problems are referred to as the rating and sizing problems. The configuration of the heat exchanger was a double pipe and carbonwater nanofluid was utilised as a heat exchanging medium within the heat exchanger. The equipment allows students to quickly assess heat transfer rates by forced convection. Only two important relationships constitute the entire thermal design. The heat transfer enhancement of tio2 nanofluid was considerably improved at higher working temperature and high concentration because of the improvement of. Because at higher flow rates, the dispersion effects and chaotic movement of the nano particles intensifies.
Wa series carbon fibre reinforcement optionally applications examples. As the effect of using al2o3 nanofluid as a cooling medium in shell and tube heat exchanger on the. In particular, the heat transfer coefficient increases appear to go beyond the mere thermalconductivity effect, and cannot be predicted by traditional purefluid correlations such as dittusboelters. The overall heat transfer coefficient of alwater and tio 2. Heat transfer enhancement in shell and tube heat exchanger by using iron oxide nanofluid 1sunny rach,2pratik patel 3dr. Heat transfer through heat exchanger using al2o3 nanofluid at. Thermal and hydraulic performance of a heat exchanger. Introduction particles of size range 1100 nm are considered nanoscale. A nanofluid is a two phase fluid of solidliquid mixture and heat transfer performance of nanofluids are expected to be significantly.
Heat transfer through heat exchanger using al2o3 nanofluid. The darcybrinkmanforchheimer model is adopted to describe the flow in the porous regions, and the governing equations with the appropriate boundary. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Discrete phase model has been worked for the inspection by using cfd software fluent 14. Applications of nanofluid for heat transfer enhancement. This study analyzes the characteristics of alumina al 2 o 3water nanofluid to determine the feasibility of its application in an aircooled heat exchanger for heat dissipation for pemfc or electronic chip cooling. Thermal performance in helically coiled heat exchangers was experimentally and numerically investigated by jayakumar et al. Introduction suspensions of solid submicron and nanometersized particles in various fluids also called nanofluids have been considered for applications as advanced heat transfer fluids for. Fundamentals of heat exchangers linkedin slideshare. The heat transfer enhancement of tio2 nanofluid was considerably improved at higher working temperature and high concentration because of the improvement of thermal properties. Twophase flow heat exchangers are vital components of systems for power generation, chemical processing, and thermal environment control.
The heat transfer performance of cntwater nanofluid in a shell and tube heat exchanger is approximately 24% higher in comparison to double pipe heat exchanger. Application of nanofluids in thermal design 79 where. Ahuja 5,6 has performed experiments on the heat transfer enhancement in the laminar flow of water with microsized polystyrene suspension. Heat transfer enhancement by using zno water nanofluid in. Enhancement in heat transfer has been studied earlier with the help of suspended microparticles. He looked at my resume, asked my pay rate, and hours.
Heat transfer enhancement is increasing with the nanoparticle and using helical coil tube geometry. A heat exchanger is a system used to transfer heat between two or more fluids. Calculation of heat transfer coefficient of mwcnttio2. Course m2007 heat exchanger fundamentals to receive credit for this coursethis document is the course text. The effectiveness is determined as a function of heatexchanger size for sets of fixed operating conditions. Heat exchangers are used in both cooling and heating processes. Pdf cfd analysis on finned tube heat exchanger using alumina. Research article heat transfer of nanofluid in a double. Numerical analysis of fe3o4 nanofluid flow in a double pipe u. Nanofluids are a new class of advanced heat transfer fluids engineered by dispersing nanoparticles smaller than 100 nm in diameter in conventional heat transfer fluids. Typical microreactor and crossflow heat exchanger geometric configuration 2. The heat transfer performance of the plate heat exchanger phe was investigated using mwcnttio nano.
Sarafraz and hormozi 2 found heat transfer enhancement of 67% at 1. The results showe that the temperature difference and heat transfer coefficient for heat exchanger with finned tube is higher than with smooth tube. Shell and tube heat exchanger was used to compare turbulent heat transfer performance of two types of nanofluids, al 2 o 3 and tio 2 with water as base fluids 9. Energy effectiveness for the heat exchangers in the analysis four heat exchanger of different mass flow rate has been investigated. In the present paper, the heat transfer and fluid flow characteristics of a coppermade heat exchanger were experimentally studied. The art and science of the design of such heat exchangers have advanced considerably in recent years. This paper investigates the enhancement of heat transfer coefficient and nusselt number of a nanofluid containing nanoparticles. The computational fluid dynamic code is used to simulated different concentrations of nanofluid 0. In this study, the performance of threefluid crossflow heat exchangers is deter mined and presented graphically in terms of the temperature effectiveness of two of the fluids referred to the third fluid. Effects of temperature and concentration of nanoparticles on nusselt number changes and heat transfer coefficient in a double. Annulargroove heat exchanger rwa heat exchanger for heating or cooling of highly corrosive media corrosion resistant one side. Heat transfer of nanofluid in a double pipe heat exchanger. Q f ua i where, the factor f is a correction factor, and the log mean temperature deference is based upon the counter.
The normal maximum operating temperature for a plate heat exchanger is approximately 120 degrees celsius. Nguyen experimentally investigated the heat transfer in phe and reported an enhancement in the heat transfer rates 7, pantzali et al also studied the effects using cuo nano fluids in the similar apparatus, both experimentally and numerically, and confirmed the later mentioned behavior 8. Analysis of heat transfer enhancement of heat exchanger. Improving heat transfer is a critical subject for energy conservation systems which directly affects economic efficiency of these systems. Pdf a nanofluid is a mixture of nano sized particles of size up to 100 nm and a base fluid. The relative importance of nanofluid parameters for heat transfer evaluated in this article allows engineering nanofluids with desired set of properties. In this work by observing the experimental results for thermo physical properties of nanofluid and experimental results for test section and heat exchanger the following conclusions can. Cfd study for cross flow heat exchanger with integral finned tube. Conclusions the obtained results clearly show that the addition of particles in a base fluid produces a great increase in the heat transfer.
The water temperatures at the inlet of test tube were 50, 60, 70, 80 c. Pdf application of nanofluid in heat exchangers for. Operating any plate heat exchanger at temperatures above the design temperature of the gasket material will result in gasket and adhesive failure. Their results indicated that heat transfer coefficient was greatly enhanced and depends on the reynolds number, the particle size. The increase of heat transfer coefficient also depends proportionally on the flow rate of the nanofluid. Pdf heat transfer enhancement with al2o3 nanofluid in.
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