iosr-JMCE   Volume-5 ~ Issue-6

Paper Type	:	Research Paper
Title	:	Comparative Study of Rectangular, Trapezoidal and Parabolic Shaped Finned Heat sink
Country	:	India
Authors	:	Ambeprasad.S.Kushwaha, Prof. Ravindra Kirar
	:	10.9790/1684-0560107

Abstract: This paper deals with the comparative study of heat sink having fins of various profiles namely Rectangular, Trapezoidal and Parabolic as heat sinks are the commonly used devices for enhancing heat transfer in electronic components. For the purpose of study heat sink is modeled by using the optimal geometric parameter such as fin height, fin thickness, base height, fin pitch as 48 mm, 1.6 mm, 8mm, 2mm and after that simulation is done at different heat load of 50W, 75W, 100W and with a air flow at 15CFM and air inlet temperature is taken as 295 K. The simulation is carried out with a commercial package provided by fluent incorporation. The result obtained taking into consideration only the thermal performance. As per the current era of the technological development everything is needed to be compact; whether it is a normal computer or laptop or the rack server we need everything that can be placed in a small space, so here the space constraint plays an major role as you cannot install a large heat sink for your device as it increases the size and the cost. So in this paper the pitch of fin is kept 2mm.

Keywords - Fin pitch, Heat Sink , Surface Nusselt Number, Temperature, Thermal Resistance.

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[2]. Mohsin et al. "Optimization of Cylindrical Pin-fin heat sinks using Genetic Algorithm" IEEE Transactions on components and packaging technologies, Vol. 32, No. 1, March 2009.
[3]. Arularasan R. and Velraj R. "CFD Analysis in a Heat sink for cooling of Electronic devices" International Journal of The Computer, the Internet and Management Vol. 16.No.3 (September-December, 2008) pp 1-11
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[5]. W. A. Khan, J. & R. Culham & M. M. Yovanovich. "The Role of Fin Geometry in Heat Sink Performance" Transactions of the ASME Vol. 128, dec 2006.
[6]. Laxmidhar Biswal & Suman Chakraborty and S. K. Som. "Design and Optimization of Single-Phase Liquid Cooled Microchannel Heat Sink" IEEE Transactions on components and packaging technologies, Vol. 32, No. 4, December 2009.
[7]. Vafai, K. and Zhu, Lu., (1999), "Analysis of two-layered micro channel heat sink concept in electronic cooling", International Journal of Heat and Mass Transfer, Vol. 42, pp. 2287-2297.
[8]. Shashank Deorah "CFD Analysis of a vertical tube having internal fins for the Natural Convection"
[9]. Kai shing yang & yur tsai lin "Heat transfer characteristic of heat sink influence of fin spacing at low Reynolds number region" International journal of Heat and Mass Transfer vol.53 issue 25-26 Dec 2010
[10]. Emre Ozturk and Ilker Tari "Forced Air Cooling of CPUs with Heat Sinks: A Numerical Study" IEEE transactions on components and packaging technologies, Vol. 31, NO. 3, Sep 2008.

Paper Type	:	Research Paper
Title	:	Permeation Properties of Bacterial Concrete
Country	:	India
Authors	:	Srinivasa Reddy V, Sreenivasa Rao D, Seshagiri Rao M V, Sasikala Ch
	:	10.9790/1684-0560816

Abstract: An experimental study on effect of calcifying bacteria on permeation properties (such as absorptivity and sorptivity) of bacterial concrete is outlined in this paper. The rate of water absorption, water absorption capacity, sorptivity and porosity tests were then performed on the samples of concrete treated with bacteria of ordinary (M20), standard (M40) and high strength (M60 and M80) grades, to assess the enhancement of permeation properties due to biomineralization in bacterial concrete. The results show that, absorptivity, sorptivity and porosity of bacterial concrete are much lower than the corresponding characteristics of controlled concrete. These characteristics are noticeably enhanced by the addition of bacillus subtilis JC3 to the concrete. It also indicated from the chemical analysis that the cement-phase composition of bacterial concrete has significant amount of calcium precipitate compound. The study of porosity is fundamental for understanding phenomena of water transport within pore structure and interactions between concrete and water. Water can penetrate a solid because there are interconnected channels (pores) inside the solid that facilitate its transportation.The long-term durability of concrete is affected to a large extent by its permeability. Therefore, the permeation properties, rather than mechanical properties, are the important factors to study in relation to concrete durability. As a consequence, a considerable effort has to be directed toward investigation of such properties in the present study.

Keywords - bacterial concrete, bacillus subtilis JC3, Permeation, Porosity, Sorptivity, Water Absorption Capacity.

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Paper Type	:	Research Paper
Title	:	The Effect of Inoculation on Microstructure and Mechanical Properties of Ductile Iron
Country	:	India
Authors	:	Mr. Bahubali B. Sangame, Mr. Vasudev D. Shinde
	:	10.9790/1684-0561723

Abstract: The current work proposes thermal analysis system for analysis of ductile iron solidification processing. The system consists of standard pouring cup with built in thermocouple. The thermocouple is connected to data logger system so as to store temperature data of solidification sequence. The ductile iron treatment consists of composition control, melt pre-treatment, magnesium treatment and inoculation processing. Even small change in processing can be monitored by thermal analysis and its effects on final microstructure and mechanical properties were studied. Along with test cups, the tensile test bars were also poured and analyzed for correlating the mechanical properties with solidification sequencing. The melting trials with varying amount of inoculation processing were conducted to study its effect especially on amount of nodule count, nodularity and amount of pearlite and ferrite phase. As the microstructure decides the final mechanical properties in ductile iron castings, the nucleation and proportion of these phases is of paramount importance during solidification. The thermal analysis of base metal and inoculated material can be effectively used for improving mechanical properties of ductile iron castings.

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Paper Type	:	Research Paper
Title	:	Working with JIT requires a Flexible Approach
Country	:	India
Authors	:	D. K. Singh, Dr. Satyendra Singh
	:	10.9790/1684-0562428

Abstract: Flexibility in management is essential today to survive in the most changing and turbulent environment, especially in the global changing international trade scenario and competitiveness in the world market. More transparency and a greater sense of participative decision-making at different levels of management decisions are vital. Decisions made with an open mind without any presumptions or constraints help in sustaining conducive atmosphere with respect to encouraging innovation in the organization. Flexibility in manufacturing ensures customization of products, which have maximum customer satisfying capability. JIT is an innovative management philosophy which evolved in Japan. Flexibility in organizational management as well as manufacturing management is essentially required to accelerate the pace of JIT implementation. This is possible because of improved communication and cordial working atmosphere among the people, which helps them to coordinate their activities effectively to achieve their common organizational goal of becoming the best and number one in the market by producing the customized products. This is what JIT asks for. In this paper, an attempt has been made to explore how the two flexibilities are critical for JIT and to what extent they affect its implementation.

Keywords: Flexibility, Customization, JIT

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