International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05| May -2017
p-ISSN: 2395-0072
www.irjet.net
Advances in Design and Development of Heat Exchangers: A Review Ankush S. Patil1, H. S. Farkade2 P.G. Student, Dept. of Mechanical Engineering, Govt. College of Engineering, Amravati, Maharashtra, India. Assistant Professor, Dept. of Mechanical Engineering, Govt. College of Engineering, Amravati, Maharashtra, India. ---------------------------------------------------------------------***--------------------------------------------------------------------2. LITERATURE REVIEW Abstract - Heat exchangers are the devices or equipment 1
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which are used to transfer heat from one medium to another medium without mixing them. The objective may be either to remove heat from a fluid or to add heat to a fluid. In great extent the research is going on for further enhancing the heat transfer through heat exchangers. In the present paper, research done by various researchers to increase the effectiveness of heat exchanger has been discussed. Through detailed analysis it has been observed that corrugated plate heat exchanger have maximum rate of heat transfer.
Corrugated plate heat exchangers are used to transfer heat but its manufacturing is very typical as compared to the plate heat exchangers. Corrugate plates contain sinusoidal shape plates which contain crest and trough which are typical to manufacture. Any fault in design will reduce the rate of heat transfer. With advances in numerical techniques and computation power, Computational Fluid Dynamics (CFD) can be used to predict the performance of machines in design phase only without manufacturing them. Many commercial software’s are available in the market. By using CFD, information about the output temperature, velocity, pressure and other non-dimensional parameters can be obtained. CFD is not only useful to predict the performance but it also helpful to determine the effect of change in any design parameter on its output. In Computational Fluid Dynamics, geometry of machine is created and meshing is done for domain. Meshing helps in the discretization of the domain into small elements. Governing equations are applied on these discrete elements to find numerical solutions regarding pressure distribution, temperature gradients etc.
Key Words: Corrugated plate heat exchanger, CFD, Parallel flow, Counter flow, LMTD, Heat transfer Effectiveness. 1.INTRODUCTION Devices which are used to transfer heat between two same or different fluids without mixing them are called heat exchangers. The Heat gets transferred from hot fluid to the cold fluid by convection. For achieving high efficiency, the rate of heat transfer between the fluid and metal should be maximum. The one way to enhance it is by increasing the surface area of heat exchanger. Heat exchangers are majorly classified as Recuperators and Regenerators. Recuperators are also called as surface generators. Recuperators are another important type of heat exchanger which extract and delivers heat on the either sides of partition wall (Generally in the form of Tubes and Pipes). Automobile or car Radiator, Oil cooler, condenser, superheaters, economiser are the examples of Recuperators. Regenerators are further sub-divided into direct and indirect contact type heat exchangers. Indirect contact type of heat exchanger are further classified into tubular, extended surface and plate type of heat exchanger. Among all, plate type heat exchangers are mostly used in industries such as automobile industries, dairy, chemical industries, power processing industries, pharmatical industries. The plate heat exchanger may be plane or may have some distortions in it. Creating uniform rising and falling in waves is very normal. and it is known as corrugated plate heat exchanger. Corrugated plate heat exchanger is of sinusoidal shape which contains crest and trough due to which rate of heat exchanger increases. The overall performance, effectiveness and the rate of heat transfer of corrugated plate heat exchanger is much higher as compared to the plane plate heat exchanger.
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2.1Experimental Studies on Corrugated Plate Heat Exchanger Mohammed and Abed numerically studied laminar forced convection heat transfer and fluid flow characteristic in a corrugated channel. Temperature of the channel walls was maintained constant which was higher than fluid temperature. Effect of wavy angle and Reynolds number were studied on fluid flow and heat transfer. The range of the Reynold`s number was carried out for the solution was found out to be 500 to 2500, wavy angles range was from 0° to 60° and Prandtl number was 0.7. It was found that the optimum values of the heat transfer enhancement and pressure drop were 3.6 and 1.11 times higher than those from the plane channel at wavy angle λ = 40°, respectively [1]. Marjan et.al has made an experimental study over corrugated plate heat exchanger by using multi-walled carbon nanotubes (MWCNT). To investigate friction loss, heat transfer coefficient by convection, Nusselt number, pumping power and pressure drop in a counter flow corrugated plate heat exchanger different water-based nano-fluids such as Gum Arabic-treated multi-walled carbon nanotubes (MWCNTGA), functionalized MWCNT with cysteine (FMWCNT-Cys) and silver (FMWCNT-Ag) were employed as coolants. From the experimentation it was found that by increasing Pecelet
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