International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 07 | July-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 617 Experimental Study of Heat Transfer Coefficient of Water In Horizontal Tube Suraj V. Kadam 1 , M.D. Hambarde 2 1 Department of Mechanical Engineering, MIT Pune, Savitribai Phule Pune University, Maharashtra, India 2 Department of Mechanical Engineering, MIT Pune, Savitribai Phule Pune University, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract –An investigation is done for studying the effect of heat flux and mass flux on the variation of heat transfer coefficient for the water inside the tube. As many applications are involve the heat transfer coefficient inside the small diameter tube Like,heat exchangers, refrigerants boilers and some food industries are also require for food processing. The flow inside the plain tube is two phase flow, for this experimental setup is designed which include the copper tube with internal diameter of 8mm and outer diameter of 10mm, length of the test section is 1.5m, heat flux range is fixed in the range of 1 kW/m 2 to 9 kW/m 2 and mass flux range is fixed within the range of 50 kg/m 2 s to 220 kg/m 2 s.the system pressure is atmospheric hence water properties are considered according to the saturation temperature and pressure. This study will help to decrease the size and actual design with same efficiency with reduced material cost. Key Words: two-phase, flow boiling, water, calculation, correlation. 1.INTRODUCTION The interest in this experimentation is to decrease material and also operating cost. Variety of refrigerant which are present in the markets according to their application but cost of these refrigerants are comparatively much more than the water hence can’t be used in the huge amount. Now a day’s conventional ways are preferred more because they are more efficient and safe for both to humans and nature too. For using water as a refrigerant properties of water are need to be reconsidered at the two phase condition. Designing of the condenser or the evaporator is require actual heat transfer rate which will help to reduce the size of the equipment otherwise problem of over-design or under-design of evaporator, condenser or such type of two phase process equipment may occurs. The correct prediction of the heat transfer coefficient in two phase flow is being considered as very important, as we seen from the past few year experimental investigations conducted in this field. The first question comes in mind that why water? As in recent days there are so many supplements are available for the water with better results. The reason to choose water as working fluid is to minimize the manufacturing cost, it is not hazardous to human health and there are some application where water is the only option available like power plants, the amount used in the power plant is very huge to produce electricity and for this purpose heat transfer coefficient of water is need to reconsidered. Chen (1996) was the first investigate the heat transfer in vertical tube for flow boiling and still there are series of works have been recently pursued at the Purdue University boiling and two- phase flow laboratory ( PU – BTPFL ) based on the methodology that were used to predict critical heat flux (CHF) for water in tube. The boiling process is categorized in two type pool boiling and flow boiling, pool boiling mechanism is easy to understand the key point for this study is concentrated on flow boiling. In boiling mechanism heat is transferred from heated surface to water but the bulk in contact with the surface is not the same hence is difficult to find the exact heat transfer rate to the flow boiling. There are so many researchers have done work on this before and some correlations are also developed by them to calculate the heat transfer coefficient directly. Flow boiling involves bulk motion of liquid and buoyancy effect that is why generalized theories are not available for the flow boiling due to various flow complexities i.e. bubble growth, separation, coalescence, effect of flow hydrodynamics, velocities and the variation in the flow patterns of the two phase flow. Although two- phase flow maps are available for distinguishing the flow regions within two phase flows such as slug and bubbly flow in the pipe but it should be noted that the subject of flow transition between these regimes is an area of active research. so recent activity carried out in order to investigate the behavior of the flow boiling heat transfer in small diameter channels there is a still lack of information and reliable data of engineering design and application. Analysis of these earlier works shows that the major parameters affecting the HTC under flow boiling is heat flux saturation pressure and thermo-physical properties of the working fluid. Designing of the heat treatment equipment is very complicated task and for calculating the exact heat transfer rate properties of the working fluid is very necessary to understand irrespective of the manufacturing cost and running cost. As the size of the equipments are