Journal of thermal engineering and applications (vol1, issue1) by STM Journals Publication

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Thermal Engineering and Applications Jan - April 2014

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Dr. Rajiv Prakash School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, India.

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Prof. Bankim Chandra Ray

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Professor and Head, Department of Metallurgical and Materials Engineering National Institute of Technology, Rourkela, India.

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Prof. D. N. Rao

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Dr. Rakesh Kumar

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Prof. Subash Chandra Mishra

Prof. Sundara Ramaprabhu

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Editorial Board

Abdul Khaliq Professor, Department of Mechanical Engineering, Delhi Technological University, (formerly Delhi College of Engineering)

AKM Sadrul Islam Head, Department of Civil & Environmental Engineering & Professor, Mechanical & Chemical Engineering Dept. Islamic University of Technology, Gahzipur Bangladesh.

Amar Mullick Professor, National Institute of Technology Durgapur, India.

Ashis Kumar Sen Assistant Professor, Department of Mechanical Engineering, Indian Institute of Technology Madras.

Asis Sarkar Assistant Professor, National Institute of Technology, Agartala.

Bashar Dan-asabe Shell Chair Office, Department of Mechanical Engineering, Ahmadu Bello University, Zaria.

Chanchal Loha Scientist Thermal Engineering, CSIR- Central Materials Research Institute

Jahar Sarkar Assistant Professor, Indian Institute of Technology â&#x20AC;&#x201C;Banaras Hindu University.

Manish Rathod Assistant Professor, Mechanical Engineering Department, S.V. National Institute of Technology, Surat.

Manoj Arya Assistant Professor, Department of Mechanical Engineering , Maulana Azad National Institute of Technology Bhopal, India.

Om Prakash, Professor Indian Institute of Technology, Banaras Hindu University Varanasi, India.

P Balachander Assistant Professor, Department of Mechanical Engineering, CEG Campus, Anna University, India.

Editorial Board

P R Tailor Department of Mechanical Engineering S. V. National Institute of Technology, Surat India.

P Selvakumar Department of Mechanical Engineering, PSN Engineering College, Tirunelveli, India.

P. Kalaichelvi Associate Professor & Associate Dean-I (Research & Consultancy) Department of Chemical Engineering National Institute of Technology Tiruchirappalli India.

Prosejit Das Scientist, CSIR-CMERI & Assistant Professor, CSIR Durgapur, India.

Ramjee Repaka Assistant Professor School of Mechanical Materials and Energy Engineering Indian Institute of Technology Ropar.

Randip Das Professor and Head of the Department, Dept. of Mechanical Engg. Indian School of Mines, Dhanbad India.

Satyabhama Bhat Assistant Professor Department of Mechanical Engineering National Institute of Technology Karnataka, Surathkal.

Shailendra Kumar Shukla Associate Professor, Mechanical Engineering Department, Indian Institute of Technology, Banaras Hindu University, India.

Sitaram Nekkanti Professor Thermal Turbomachines Laboratory Department of Mechanical EngineeringIndian Institute of Technology, Madras.

Sudip Kumar Samanta Principal Scientist NNMT Group & Coordinator, CSIR-Central Mechanical Engineering Research Institute Durgapur, India.

Tapano Kumar Hotta Visiting Assistant Professor, Mechanical Engineering, Centre of Excellency Energy, Indian Institute of Technology Jodhpur (IITJ), India.

Director's Desk

STM JOURNALS

I take the privilege to present the print version for the [Volume 1 Issue (1)] of Journal of Thermal Engineering and Applications. The intension of JoTEA is to create an atmosphere that stimulates creativeness, research and growth in the area of in Thermal Engineering and Applications. The development and growth of the mankind is the consequence of brilliant Research done by eminent Scientists and Engineers in every field. JoTEA provides an outlet for Research findings and reviews in areas of thermal engineering found to be relevant for National and International recent developments & research initiative. The aim and scope of the Journal is to provide an academic medium and an important reference for the advancement and dissemination of Research results that support high level learning, teaching and research in the domain of Thermal Engineering. Finally, and Authors for their continued support and invaluable contributions and suggestions in the form of authoring I express my sincere gratitude and thanks to our Editorial/ Reviewer board write ups/ reviewing and providing constructive comments for the advancement of the journals. With regards to their due continuous support and co-operation, we have been able to publish quality Research/Reviews findings for our customers base. I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

Dr. Archana Mehrotra Director STM Journals

Journal of Thermal Engineering and Applications

Contents

1. CFD Analysis of Tree Shaped Fin Array on Flat and Symmetrical Wedge Shaped Base Plate K. Pavan Kumar, P. V. Vinay, R. Siddhardha

2. Heat Transfer in Pool Boiling of H2O/LiBr Mixture Sathyabhama A

3. Flame Phenomenology for Premixed Methane and Propane/Air in Developed Meso-scale Channels at Ambient Conditions Hamisu Adamu Dandajeh

4. Modeling and Simulation of Spiral Plate Heat Exchanger T.V. Karthick, D. Karthikeyan, S. Ramachandran, P. Kalaichelvi, S .Sundaram, R. Jaishree

Journal of Thermal Engineering and Applications Volume 1, Issue 1 www.stmjournals.com

CFD Analysis of Tree Shaped Fin Array on Flat and Symmetrical Wedge Shaped Base Plate K. Pavan Kumar*, P. V. Vinay, R. Siddhardha Department of Mechanical Engineering, GVP College for Degree and PG Courses (Technical campus), Rushikonda, Visakhapatnam, A.P., India Abstract Heat generated from electronic chips is usually siphoned off by placing a heat sink. Due to the poor heat transfer capability of air extended surfaces are used as heat sink. Constant research is being carried out on the selection of geometry and material of extended surface for effective heat transfer. In the present work CFD analysis (ANSYS 14) is done on Tree fin array using FLUENT on a flat shaped base and symmetrical wedge shaped base keeping the base temperature, volume of material and velocity of air constant. The array with symmetrical wedge shaped base is proved to have better heat dissipation rate.

Keywords: Tree fin array, symmetrical wedge, tree fin

Journal of Thermal Engineering and Applications Volume 1, Issue 1 www.stmjournals.com

Heat Transfer in Pool Boiling of H2O/LiBr Mixture Sathyabhama A.* Department of Mechanical Engineering, NITK Surathkal, Srinivasnagar, Mangalore, Karnataka, India

Abstract This paper presents the results of an experimental investigation carried out to study the heat transfer in saturated nucleate pool boiling of the H2O/LiBr bromide mixture on a heated vertical copper cylindrical rod at atmospheric pressure. The mass fraction of lithium bromide was varied from 0 to 0.5. It was observed that the heat transfer coefficient increased for the mixture with an increase in heat flux and lithium bromide concentration. A correlation for the heat transfer coefficient as a function of heat flux and lithium bromide concentration was obtained with a good fit to experimental data.

Keywords: H2O/LiBr, pool boiling, heat transfer coefficient, correlation

Journal of Thermal Engineering and Applications Volume 1, Issue 1 www.stmjournals.com

Flame Phenomenology for Premixed Methane and Propane/Air in Developed Meso-scale Channels at Ambient Conditions Hamisu Adamu Dandajeh* Department of Mechanical Engineering, Ahmadu Bello University Zaria, Nigeria Abstract This paper reports the development of a meso-scale channel for propagation of methane and propane-air mixtures at low Reynolds number. An experiment was conducted in 3, 4 and 5 mm internal quartz tube diameters at premixed conditions of the fuel/air. The tubes were vertically mounted and sometimes preheated uniformly laterally. Uniformly laterally heating gives a zero temperature gradient. Flame phenomenology at different equivalence ratios (φ) of the mixture was discussed. It was observed that quenching position of the flame front somewhat increases with decrease in mixture flow rate(Q).The presence of a flame trap near the mixing chamber was found to intensify the acoustic frequency generated. For the first time, periodic accelerating and decelerating flames (PADFs) were observed at higher Q and φ = 0.66 for propane/air mixture in 5 mm tube.

Keywords: Meso-scale, flame, lean-premixed

Journal of Thermal Engineering and Applications Volume 1, Issue 1 www.stmjournals.com

Modeling and Simulation of Spiral Plate Heat Exchanger T.V. Karthick1, D. Karthikeyan1, S. Ramachandran2, P. Kalaichelvi1*, S .Sundaram3, R. Jaishree1 1

Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India 2 Jayam College of Engineering and Technology, Dharmapuri 636813, India 3 PRIST University, Trichy-Thanjavur Highway, Vallam, Thanjavur 613 403, India Abstract The spiral-plate heat exchanger (SHE) offers efficiency in spacing and reduces heat losses. SHE’s offer high reliability, lower spaces occupancy, high heat transfer coefficient and on-line performance in many severely fouling services such as slurries. Experimental investigations were conducted in a spiral plate heat exchanger with hot water as the service fluid and cold water in different flow rates as the cold process fluid. The experiments were conducted essentially in the laminar flow range of both the process and service fluids. Computer software which uses FEM and computational fluid dynamics were used to simulate the spiral heat exchanger. The experimental data of flow rates and inlet temperature were used as input data to the simulated SHE. The values like heat transfer coefficient, outlet temperature etc. obtained from experiment and simulation were compared. The simulated Nusselt numbers on the cold side was correlated with Reynolds numbers and Prandtl number and were fitted into a power law equation. Hence Dittus-Boelter’s equation for spiral plate heat exchanger was obtained. The predicted Nusselt number showed a spread of ±2% over the simulated values. Keywords: Spiral plate heat exchanger, modeling, simulation and computational fluid dynamics.