Computational Investigation of Normal and Hybrid Cooling Fins of Internal Combustion Engine
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1 Computational Investigation of Normal and Hybrid Cooling Fins of Internal Combustion Engine Aswin Mohan, R. Titus, Adarsh Kumar.P.S Abstract In this research work a hybrid material (Aluminium-Copper) compound design for engine fins is proposed. A standard single cylinder 4 stroke petrol engines is taken for reference and the preliminary work will be the simulation of existing fin model and establish a new model with al-cu hybrid fins and modelled for simulation. The simulation follows a DOE (Design of Experiments) method, where vehicle velocity and load are varied by three different levels each, so a total of 9 simulation configuration is achieved and the same are simulated to evaluate the heat transfer in both single material mode and hybrid model. Cosmo Flow works is a commercial CAE tool which is used for almost all type of engineering simulation and also has rich set of thermal analysis tool; Fluent is one of the best computational fluid dynamics tools available in the Cosmo Flow Works environment which will be used to perform these thermal analyses. Index terms-heat transfer, Aluminum fins, Al-Cu hybrid fins, design of experiments method, need cooling mechanisms to operate smoothly.cooling is also needed because high temperatures damage engine materials and lubricants. Engine cooling removes energy fast enough to keep temperatures in its limit so the engine can work properly. In our work, hybrid metal fin is proposed for air cooled IC engine. Aluminum alloy is used as fin material in most of the 4 stroke engines. Copper and copper alloys have more thermal conductivity than aluminum and aluminum alloys. Problem in using copper and its alloy as fin material is cost. It can be solved by using combination of copper and its alloy with existing material. It is not possible to use in the form of alloy of aluminum and copper. It can be done by electro plating or fastening of copper with aluminum. So, purpose of this project is to study performance of both normal and hybrid material fins by numerically and experimentally. I. INTRODUCTION Air cooled engines depends on its cooling through the materials of the engine fin and velocity of the vehicle. Normally aluminium alloy s is preferred for the engine components like piston and casing, because of its light weight and heat transfer capacity. If the present cooling method is improved it will increase the thermal efficiency of the engine as well as life of the same.ic engines generate mechanical energy from the thermal energy obtained by burning of fuel. Internal combustion engines remove waste heat through cool intake air, hot exhaust gases, and explicit engine cooling.engines with higher efficiency have more mechanical output and less waste heat. Some waste heat is essential. It guides heat through the engine parts. Thus, all heat engines Manuscript received February, Aswin Mohan, Thermal Engineering, RVS College of EngineeringAndTechnology. Coimbatore, India. Asst. Prof. Titus.R, Mechanical Engineering,RVS College of Engineering And Technology, Coimbatore, India. Adars Kumar. P.S, Thermal Engineering, RVS College of Engineering And Technology, Coimbatore, India. II. LITERATURE REVIEW M.J.Abedin [1] presented a survey on the energy balance of IC engines using alternative fuels. An extensive theory on the energy balance is discussed including the application of the first-law of thermodynamics and variations in heat transfer correlations for wall heat loss evaluation.mushin A. Ali [2] presents that cooling mechanism of the air cooled engine depends upon the fin design of the cylinder head and block. Hiren P. Hirparaet. [4]presented study of different research papers related to the extended surfaces and effect on heat transfer rate by changing the cross-section, fin pitch, fin material, fin thickness, air velocity, and air exposed angle etc. This review study is useful to know betterment of fin material and fin geometry.kavita H. Dhanawade[5]presented thermal analysis of square and circular perforated fin arrays by forced convection. It is observed that the Reynolds number and size perforation have a larger impact on Nusselt number for the both type of perforations. R.J.Goldsteinet. [6] presents many papers reviewed herein relate to the science of heat transfer, including numerical, analytical and experimental works. Besides reviewing the journal 403
2 articles in the body of this paper, we also mention important conferences and meetings on heat transfer and related fields, major awards presented in 2003, and books on heat transfer published during the year.ahmed F. Khudheyer presents study the effect of flow bypass on the performance of a shrouded longitudinal fin array. The experiments were parameterized by the clearance ratios, C/H, C/S, and f Reynolds number, Re [7].RafaKrakowskiet. presents a model test stand designed and built using original components of diesel engine 4CT90 is presented. The stand provides working conditions as close as possible to the exploitation conditions of the engine cooling system. The results of measurements of the coolant pump flow at different speed water pump were also presented in this paper [8].Mummer presented a louvered fin and plate intercooler characteristics and their effects to intercooling were experimentally investigated. Details of experimental setup and method used in this study are also provided in the content of present paper [9].Mr. Maul S. Patel said that doing thermal analysis on the engine cylinder fins; it is helpful to know the heat dissipation inside the cylinder. The accurate thermal simulation could permit critical design parameters to be identified for improved life [10].Ashishkumar N. Parmaret. al said that air-cooled engine builds heat, the cooling fins allow the wind and air to move the heat away from the engine. Low rate of heat transfer through cooling fins is the main problem in this type of cooling. The main of aim of this work is to study various researches done in past to improve heat transfer rate of cooling fins by changing cylinder block fin geometry, climate condition and material [11]. generation during different loads given below and is used in simulation. The following figure shows the Generation during Loads Normal Fins Load Ambient Temperatur e ( C) Table I Load Details Averag e Temp of engine outer surface ( C) Temp differenc e (dt) generatio n (W) Idle Partial Full Fig Domain III. COMPUTATIONAL INVESTIGATION A. Test engine specification Displacement : cc Max. Power : 7500rpm Max Torque : 4500rpm Engine Type : 4-s, SI Engine Fig 3.2 Mesh B. Simulation Analysis Type : External Flow Solver : COSMOS FLOWWORKS Boundary Condition : Free Stream Velocity generation (solids) generation is calculated from following relation: Q UAdT U : Aluminum and air 83 W / m 2 K. A : m 2 dt : Temperature difference ( C) The above figures show the computational domain and mesh of the model. The mesh details are as follows Aluminum fin Hybrid fin Solid cells 14,700 16,300 Partial cells Fluid cell IV.RESULT Forced Convection Simulation of Existing Model (Aluminium), the simulation consists of 9 analyses 404
3 where three different speeds will be taken for simulation likely 8.33, and 25m/s. The following table shows the boundary conditions that are used in the simulation for each speed test (8.33, & 25 m/s). Table II Boundary Conditions Sl.No Ambient Temperature( K) Engine Surface Temperature ( K) Generatio n (W/m 2 ) Fig 4.1 Fluid Temepraure 8.33 m/s& C Table III Forced Convection Results- Existing Model Load Idle load Partial load Full load Air velocity (m/s) Generation (W/m 2 ) Fluid Temperature ( C) Fig 4.2 Fluid Temperature m/s & C Table IV Forced Convection Results Hybrid Model Load Idle load Partia l Load Full load Air velocity (m/s) Generation (W/m 2 ) Fluid Temperature ( C) Fig 4.3 Fluid Temperature 25m/S & C for 8.33, and m/s with W/m 2. for 8.33, and m/s with W/m 2. Fig 4.4 Fluid Temperature 8.33 m/s & C 405
4 Fig 4.5 Fluid Temperature m/s & C Fig 4.9 Fluid Temperature m/s & C The following table shows the boundary conditions that are used in the simulation of hybrid model with speed 8.33, & 25 m/s with W/m 2. Fig 4.6 Fluid Temperature m/s & C for 8.33, and m/s with W/m 2. Fig 4.10 Fluid Temperature 8.33 m/s & C Fig 4.7 Fluid Temperature 8.33 m/s & C Fig 4.11Fluid Temperature m/s & C Fig 4.8 Fluid Temperature m/s & C Fig 4.12 Fluid Temperature m/s & C for 8.33, and m/s with W/m
5 Fig 4.13 Fluid Temperature 8.33 m/s & C Fig 4.17 Fluid Temperature m/s & C Fig 4.18 Fluid Temperature m/s & C Fig 4.14 Fluid Temperature m/s & C Fig 4.15 Fluid Temperature m/s & C The following figures show simulation result for 8.33, and m/s with w/m 2. The plot shows fluid temperature. V.CONCLUSION In this work heat transfer simulation of aluminium fins at three different speeds is done and presented. Minimum temperature variation is absorbed at all loads and speeds without cooling. Computational investigation is completely done for aluminium and hybrid fins. Hybrid fins shows better heat transfer rate than normal fins. More heat is rejected from the engine from hybrid fins than from normal fins for same load conditions and fluid velocity. At idle, partial and full loads, the temperature of the fluid is increased by an average of 4.75 o C, 3.81 o C, 4.3 o C respectively, for hybrid fins. REFERENCES Fig 4.16 Fluid Temperature 8.33 m/s & C [1] Abedin M.J. et. al (2013) Energy balance of internal combustion engines using alternative fuels, Renewable and Sustainable Energy Reviews, Vol 26, pg: [2] Ali M.A. et. al (2014) Design Modification And Analysis of Two Wheeler Cooling Fins-A Review, International Journal of Engineering and Applied Sciences, Vol. 5. No. 01, pg: [3] Chatterjee D. et. al (2009) Numerical investigation of forced convection heat transfer in unsteady flow past a row of square cylinders, 407
6 International Journal of and Fluid Flow, Vol 30, pg: [4] Darici S. et. al (2012) Determination of Transfer Rate And Pressure Drop Performance Of An Intercooler For Heavy Duty Engines, International Journal of Arts & Sciences, Vol 5, pg: [5] Dhanawade K.H. et. al (2014) Thermal Analysis of Square and Circular Perforated Fin Arrays by Forced Convection, International Journal of Current Engineering and Technology, Special Issue-2, pg: [6] Goldstein R.J. et. al (2006) transfer-a review of 2003 literature, International Journal of and Mass Transfer, Vol 49, pg: [7] Khudheyer A.F. et. al (2011) Study the Effect of Flow Bypass on the Performance of A Shrouded [11] Paul A.J. et. al (2012) Experimental and Parametric Study of Extended Fins In The Optimization of Internal Combustion Engine Cooling Using CFD, International Journal of Applied Research in Mechanical Engineering, Volume-2, Issue-1, pg: [12] Pooranachandran K. et. al (2011) Experimental And Numerical Investigation Of A Louvered Fin And Elliptical Tube Compact Exchanger, Institute for Energy Studies, Anna University, Chennai, India. Longitudinal Fin Array, ARPN Journal of Engineering and pplied Sciences, Vol. 6, No. 8, pg: [8] Krakowski R. et. al (2013) Internal Combustion Engine Cooling System With Elevated Coolant Temperature Research On The Model Test Stand, Journal of KONES Powertrain and Transport, Vol. 20, No. 4, pg: 1-8. [9] Magarajan U. et. al (2012) Numerical Study on Transfer of Internal Combustion Engine Cooling by Extended Fins Using CFD, Research Journal of Recent Sciences, Vol. 1(6), [10] Patel S.M. et. al (2014) Thermal Analysis of I C Engine cylinder fins array using CFD, International Journal of Advance Engineer ing and Research Development, Volume 1,Issue 5, pg: 1-11 [18] Trujillo E.C. et. al (2011) Methodology for the estimation of cylinder inner surface temperature in an air-cooled Engine, applied thermal engineering, Vol 1, pg: [19] Zupancic B. et. al (2013) Computer-aided physical multi-domain modelling: Some experiences from education and industrial applications, Simulation Modelling Practice and Theory, Vol 33, pg: [13] Salwe A. et. al (2014) Comparison of Forced convective heat transfer coefficient between solid pin fin and perforated pin fin, International Journal of Engineering Research and General Science Volume 2, Issue 3, pg: [14] Saravanan S.V. et. al (2014) Numerical Analysis and Optimization of Engine Cylinder Fins of Varying Geometry and Material, International Journal Of Engineering Sciences & Research Technology, Vol 3, pg: [15] Silva L.E. et. al (2003) Numerical simulation of two-dimensional flows over a circular cylinder using the immersed boundary method, Journal of Computational Physics, Vol 189, pg: [16] Sorathiya A.S. et. al (2014) Review Paper on Effect of Cylinder Block Fin Geometry on Transfer Rate of Air-Cooled 4S SI Engine, International Journal of Recent Development in Engineering and Technology, Volume 2, Issue 1, pg: [17] Sorathiya A.S. et. al (2014) An Effect of Different Parameters of Fins on Transfer of IC Engine- Review Study, Journal of Mechanical and Civil Engineering, Volume 11, Issue 3, pg
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