International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 06 | June -2017
p-ISSN: 2395-0072
www.irjet.net
Review on Experimental and Numerical Analysis of Heat Transfer and Friction Factor using Almond Dimple in Rectangular Duct Harshal Hambirrao Pawar1, Prof. D. G. Kumbhar2 1PG
Student, Mechanical Department, Bharati Vidyapeeth University, College of Engineering, Pune, Maharashtra, India, 2Associate Professor, Mechanical Department, Bharati Vidyapeeth University, College of Engineering, Pune, Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – A great emphasis has been given in developing
Thermal power plants, process industries, heating and cooling in evaporators, air-conditioning equipment, radiators for space vehicles, automobiles, Electronic devices etc. are some areas where heat transfer enhancement techniques are widely used. The focus on using dimples on surface for increasing the heat transfer has been researched by many researchers.
an apparatus and in performing experiments to define the situations under which an effective technique will improve heat transfer. Heat transfer technology is being highly used in heat exchanging applications like refrigerators, automobiles, process industries etc. Enhanced heat transfer study is also referred to heat transfer enhancement, augmentation and intensification. Thought process of saving energy a raw material has led to efforts to build extra efficient heat exchange equipment. Standard techniques of heat transfer like active, passive and compound are also addressed in this paper. Enhancement of heat transfer is one of most important significance in almost every industry. Hence, a very effective solution of heat transfer is required for not only improving the heat transfer but also for the minimization of flow resistance as much as possible. In the past few years the idea of using dimpled surfaces over producing devices has gathered a lot of attention because of the combination of high heat transfer enhancement and low pressure loss penalty. This paper presents a review on experimental and numerical analysis of heat transfer using almond dimple on rectangular duct.
1.1 Motivation In this review paper it is proposed to carry out the experimental and numerical analysis of almond dimple considering frictional factor. The various enhancement techniques that are present for enhancing heat transfer are active, passive and compound. Among all of them active technique is used as the insert manufacturing process is simple and cheap. Also, it can be easily employed in an existing heat transfer system. An experimental system can be designed to study the effect of almond dimple in heat transfer characteristics.
1.2 Classification of Enhancement Techniques
Key Words: Reynolds’s number, Heat Transfer Rate, Friction Factor, Dimpled plates, Heat Transfer Augmentation, Almond Dimple, Rectangular Duct
Heat transfer enhancement or augmentation techniques refer to the improvement of thermo hydraulic performance of heat exchangers. Heat transfer enhancement techniques can be broadly classified into three different categories:
1. INTRODUCTION
1. Passive Techniques 2. Active Techniques 3. Compound Techniques
Heat transfer enhancement leads to saving in energy and cost. Because of the rapid increase in demand of energy around the world, reducing energy lost related with ineffective use and enhancement of energy in terms of heat have become very significant for design and operation engineers. In the past few decades various researches have been performed on heat transfer enhancement. These researches focused on finding techniques which not only increases heat transfer, but also helps in achieving high efficiency. To achieve higher heat transfer rates, various heat transfer enhancement techniques are used which can result in energy saving. It also gives more compact and less expensive equipment with higher efficiency. Heat transfers enhancement technology is widely used in heat exchanger application. Inserting different shaped elements with different geometries in channel flow is one of the widely-used heat transfer enhancement technique.
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The effectiveness of these methods is purely dependent on the mode of heat transfer type of process application of the heat exchanger. Passive Techniques Passive techniques use certain geometrical modifications like perforation, protrusions and dimples to the flow channel by adding inserts or additional devices. They change the existing flow behavior which promotes higher heat transfer coefficients and also increase pressure drop. Such techniques do not require any direct input of external power instead it uses power from the system itself which leads to increase in
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