Investigation of Heat Transfer Rate and Temperature Distribution of Different Fin Geometry Using Experimental and Simulation Method.

Authors: N. Sethuraman, Dr. P. Mathiazagan, M. Jayamoorthy, S. Vinod Raj

Abstract-- Convective heat dissipation from the standard surface can be significantly increased by the use of fins. Calculation of heat released from the fin involves a complex conjugate system of conduction and convection. The performance analysis is carried out using simulation and experimental method. Experiment carried out by using different geometry at different heat inputs. In this study, the enhancement of natural convection heat transfer from a horizontal rectangular fin embedded with rectangular perforations of aspect ratio of two has been examined using finite element technique. A fin experimental value set up is for designed developed and working procedure of the apparatus is simple. The results show that the rate of heat transfer is high for with insulated triangular fin, followed by without insulated triangular fin the results show that the rate of heat transfer is high for tapered pin fin, followed by pin fin.

References-

[1] M.Pekdemirli and A.Z Sahin ,2006, “a similarity solution of fin equation with variable thermal conductivity and heat transfer Coefficient” Mathematical and computational Applications, vol, No.1 Association for scientific Research. pp 25-30

[2] Luis I. Diez, Cristobel Cortes, Antonio Campo, “heat transfer from galvanized fins of straight and annular shape”. Mechanical engineering Department, The University of Vermont, Burlington, USA

[3] Amir Abbas Rezaei ,Masoud Zia basharhagh, Touraj Yousefi, 2010 “free convection heat transfer from a horizontal fin attached cylinder between confined nearly adiabatic walls” Experimental Thermal and Fluid Science, 34, pp 177-182

[4] Dogan, M.Sivrioglu,2010 “ experimental investigation of mixed convection heat transfer from longitudinal fins in a horizontal rectangular channel” International journal on Heat and mass transfer, 53, University of Technology, Tehran, Iran pp 2149-2158

[5] HussamJouhara, Brian P.Axcell “modeling and simulation techniques for forced convection heat transfer in heat sinks with rectangular fins” Simulation Modeling Practice and theory, 17, School of Engineering and Design Brunnel University, Uxbridge. pp 871-882

[6] Mitre J.F, Santana L.M, Damian R.B “numerical study of turbulence heat transfer in 3d p.f channels” Applied Thermal Engineering, 2010, pp (2796-2803) Department of Mechanical Engineering.

[7] Malekzadeh P, Rahideh H “two-dimensional non linear heat transfer analysis of variable section pin fin” Energy conversion and management 2010, pp (916-922) Department of Mechanical Engineering.

[8] Massimiliano Rizzi, Marco Canino, Kunzhong Hu,” Experimental Investigation of Pin Fin Heat Sink Effectiveness” MAE Department, 48-121 Engineering IV, UCLA Los Angeles, CA 90024-1597.

A Case Study on the Geotechnical Investigations of a Hydroelectric Project

Authors: R. Chitra, Manish Gupta

Abstract— Hydroelectric Projects are capital intensive high risk projects which are normally safe, but any failure can be catastrophic. An adequate assessment of site geologic and geotechnical conditions is one of the most important aspects of a dam safety evaluation. Evaluation of the safety of either a new or an existing dam requires, among other things, that its foundation has been adequately examined, explored, and investigated so that it is as fully understood as possible. Dagmara Hydroelectric Project is located near village old Bhaptiahi on left bank, about 31 km downstream of Bhimnagar barrage on Kosi river in district Supaul of Bihar. The project envisages construction of a concrete barrage of 998.5 m long, 2.345 km long Right Guide Bund, 2.345 km long Left Guide Bund, 3.35 km long Right Earthen Dam, and 2.22 km long m long Left Earthen Dam. The geotechnical investigations for the proposed Dagmara Hydroelectric Project, Supaul, Bihar was carried out by CSMRS and is discussed in this paper.

Keywords— Foundation Investigations, Plate Load Test, Standard Penetration Test, Hydroelectric Project, Insitu Permeability Test

References-

[1] Alam Singh, (1981), Soil Engineering in Theory and Practice (Vol.I), Asia Publishing House Ltd., Bombay. [2] B.M. Das (1994) ―Principles of Geotechnical Engineering‖ Third Edition, PWS Publishers, Boston.

[3] Bureau of Indian Standards IS:12169: 1987, Criterion for design of small embankment dams "Criterion for design of small embankment dams "Criterion for design of small embankment dams"

[4] Bureau of Indian Standards IS:1498: 1970, Classification and identification of soils for general engineering purposes

[5] Campanella, R. G., and Robertson, P. K. (1981). ―Applied cone research‖, Cone Penetration Testing and Experience, ASCE, Reston/VA, 343-362.

[6] CSMRS Report, (2013), Foundation Investigations for the Proposed Dagmara Hydroelectric Project, Supaul, Bihar, (Report No.: 07/SoilI/CSMRS/E/07/2013, July 2013)

[7] CSMRS Report, (2013), Geotechnical Investigations on the Borrow Area Materials for the Proposed Dagmara Hydroelectric Project, Supal, Bihar, (Report No.: 05/Soil-I/CSMRS/E/07/2013, July 2013).

[8] CSMRS Report, (2013), Laboratory Investigations on the Embankment Materials for the Proposed Dagmara Hydroelectric Project, Supaul, Bihar, (Report No.: 08/Soil-I/CSMRS/E/07/2013, July 2013)

[9] CSMRS Report, (2013), Plate Load Tests Carried out in the Foundation Area of Barrage Axis of the Proposed Dagmara Hydroelectric Project, Supaul, Bihar, (Report No.: 06/SoilI/CSMRS/E/07/2013, July 2013)

[10] EM 1110-2-2300, (1982), Earth Manual, Publication of United States Bureau Of Reclamation

[11] Fell, R., Macgregor, P. & Stapledon, D (1992) Geotechnical Engineering of Embankment Dams.

[12] Lunne, T., Robertson, P.K., and Powell, J.J.M. (1997). Cone Penetration Testing in Geotechnical Practice, Blackie-Academic Publishing/London, EF SPON Publishing, U.K., 317 p.

[13] Mayne, P.W. (1991). ―Determination of OCR in clays by piezocone tests using cavity expansion and critical state concepts.‖ Soils and Foundations, Vol. 31 (2), 65-76.

[14] Sherard, J. L., and Dunnigan, L. P. 1985. ―Filters and Leakage Control in Embankment Dams,‖

[15] Sherard, J. L., Woodward, R. J., Gizienski, S. F., and Clevenges, W. A. 1963. Earth and Earth-Rock Dams, John Wiley & Sons, New York.

[16] SP-36 (Part-I), (1987) Standard Publication on Soil Testing in Laboratory, Bureau of Indian Standards.

Performance Estimation And Analysis Of Pulse Detonation Engine With Different Blockage Ratios For Hydrogen-Air Mixture

Authors: Nadella Karthik, Repaka Ramesh, N.V.V.K Chaitanya, Linsu Sebastian

Abstract -- This paper provides an introduction to the concept of Detonation waves in the application of Pulse Detonation Engine (PDE) which includes the Detonation initiation and propagation of wave. A review of previous computational studies of Pulse Detonation Engine shows a wide variation in the performance of system. We present the results of systematic study of Pulse Detonation Engine operating with Hydrogen-Air mixture with different blockage ratios to attain high Detonation velocities. We use these results to provide an explanation for the wide variation in a system performance. The system contains the single tube with one end closed and other end opened, which is maintained at two different temperatures and pressure values. Results are computed and analyzed using Computational Fluid Dynamics (CFD) modelling.

Keywords--Blockage Ratio, C-J Velocity, DDT, Detonation, Shchelkin Spiral, Fuel-Air Mixture, Rarefaction Waves.

References-

[1] Piotr Wolanski, Detonation Engines, Journal of KONES Power trains and Transport, Vol.18, NO.32011.

[2] E.Wintenberger & J.E Shepherd, Explosion Dynamics Laboratory, California Institute of Technology, Pasadena, CA 91125.

[3] T.Bussing and G.Pappas, Adroit Systems, Inc.(ASI), An Introduction to Pulse Detonation Engine, 32nd Aerospace Sciences Meeting & Exhibit, AIAA 94- 0263.

[4] Lee, S.Y., Conrad , C, Watts, J.,Woodward, R.,Pal.,S., and Santoro, R.J , Deflagration to Detonation Transition Study using Simultaneous Schlieren and O.H PLIF Images , AIAA 2000-3217.

[5] Lindstedt, R.P, and Michel, H.J., Deflagration to Detonation Transitions and Strong Deflagrations in Alkane and Alkene air Mixtures, Vol.76, pp. 169-181.

[6] Cooper, M., Jackson, S., Austin, J.M., Wintenberger, U., and Shepherd, J.E., Direct Experimental Impulse Measurements for Detonations and Deflagrations. AIAA 2001-3812.

[7] Eidel Man., S., and Yang, X., Analysis of the Pulse Detonation Engine Efficiency. AIAA Paper 98-3877.

[8] Desbordes, D., and Vashon, M., Critical Diameter of Diffraction for strong plane Detonation, Prog.Astro.Aero, Vol.106, pp.131-143.

[9] K.Kailasanatih, Recent Developments in the research on Pulse Detonation Engines., 40th AIAA 2002-0470 Aerospace Sciences Meeting and Exhibit.

Improved Flexural Strength of Shear Beam from Treated Recycled Coarse Aggregate

Authors: Pankaj Kumar, Prof. Ragini Mishra

Abstract --Recycle coarse aggregate concrete is widely most used in the recent construction industry because of its easily availability and cheap in the market. The partial replacement of RCA with NA in this experiment. In this experiment shear behavior of 12 self-compacting recycled coarse aggregate reinforced beams (SCRAC) were casted by Nansu method with two mixing approach namely NMA and TSMAsfc. The results were maximum load at failure (Pmax), ultimate shear force at failure (Vult), shear strength, load-mid span deflection. It was found that shear strength of beams casted with treated RCA with TSMAsfc approach was maximum among all the beams as compared of beams with NMA mixing approach and natural aggregate beams.

Keywords--Recycled coarse aggregate, self-compacting concrete, EMV, NMA, TSMAsfc Flexure strength test, Loading.

References-

[1] Marta Słowik , Tomasz Nowicki, The analysis of diagonal crack propagation in concrete beams, Computational Materials Science 52 (2012) 261–267.

[2] C. Shi, Y. Li, J. Zhang, W. Li, L. Chong, Z. Xie, Performance enhancement of recycled concrete aggregate: a review, J. Cleaner Prod. 112 (2016) 466–472.

[3] D. Pedro, J. De Brito, L. Evangelista, Influence of the use of recycled concrete aggregates from different sources on structural concrete, Constr. Build.Mater.71 (2014) 141–151. [4] A. André, J. De Brito,

[4] HasanKatkhuda, NasimShatarat, Shear behavior of reinforced concrete beams using treated recycled concrete aggregate, Construction and Building Materials 125 (2016) 63–71.