iosr-JMCE   Volume-13 ~ Issue-2 ~ Mar-Apr 2016

Abstract: In the plastics industry most of the acrylics are the polymers of methyl methacrylate (PMMA). Acrylics can be available in various forms such as molding powder or casting syrups. They are mostly known for the exceptional clarity and optical properties in various fields. Acrylics are mostly used in production of fixtures because of the properties such as slow burning or self-extinguishing. The present paper covers what is acrylic, what are the various uses of acrylic, usage of acrylic in the future technology etc. Possible areas in which acrylic can serve as a useful option are also covered........

Key words: Materials, PMMA, properties, technology, work.

[1] The Acrylite brand-acrylite-colors, patterns and functions.

[2] Trademark electronic search system, US patent and registration number 0350093.

[3] [4] [6] [7]Charles A. Harper; Edward M. Petrie (10 October 2003). Plastics materials and processes: A concise encyclopedia. John Wiley & Sons. P 9. ISBN 978-0-471-45920-0.

[5] Reed business information (13 June 1974). Misused materials stoked Summerland fire. IPC magazines: 684. ISSN 0262-4079.

[6] A trademark of Cyro.

[7] Zylar, a trademark of Nova Chemicals.

Abstract: Public-Private Partnerships (PPPs) are strategies employed in the provision and development of both social and economic infrastructure facilities in many countries of the word. It is a contractual arrangement between the public and private sector through which the expertise, skills, assets and financial resources of both the public and private sectors are allocated in such a manner that provides optimal service delivery and good value to the public. The major feature in the implementation and operation of PPPs in the development and provision of infrastructure facilities is the systematic evaluation and selection of development proposals that delivers value from the money invested in the transaction.......

Keyword: Infrastructure, Development, Public-Private Partnership, Value for Money

[1]. Akintoye, A. & Beck, M. (2009). Introduction Perspectives on PPP: RICS Research, Policy, Finance and Management for Public-Private Partnerships, ed. West Sussex, Blackwell.
[2]. Babatunde, S.O., Opawale, A. &Ujadugbe, I.C. (2010) "An Appraisal of Project Procurement Methods in the Nigerian Construction Industry".Civil Engineering Dimension, 12(1), pp.1-7.
[3]. Bult-Spiering, M. &Dewulf, G. (2006) "Strategic Issues in the Public-Private-Partnership: An International Perspective. Blackwell, Oxford.
[4]. Cui, Q. &Lindly, J.K. (2010) "Evaluation of Public-Private Partnership Proposals" University Transportation Center for Alabama Report, pp.730-941.
[5]. Cui, Q, Sharma, D.,Farajian, M., Perez, M. &Lindly, J. (2010) "Feasibility Study Guideline for Public-Private Partnership Projects" UTCA, Alabama.

Abstract:In The Present Work Enhancement Of Heat Transfer In A Circular Tube Was Investigated By Inserting V-Jagged Twisted Tape.The Twisted Tape Used Had 100mm Pitch And Two Different Materials (Copper And Aluminium) Were Used .The Experiment Were Conducted Keeping Constant Heat Flux And By Varying Mass Flow Rate Using Working Medium As Air.The Heat Transfer Rate,Friction Factor, Nusselt Number Were Determined And Compared With The Plain Tube And Plain Tape. The Twisted Tape Having Jag Of Width And Depth (We=10mm,De=8mm) And (We=10mm,De=10mm) Were Used.

Keywords: Heat Transfer, Twist Ratio, Reynolds Number, V-Jagged Twisted Tape.

[1]. Hsieh And Huang , "Experimental Studies For Heat Transfer And Pressure Drop Of Laminar Flow In Horizontal Tubes With/Without Longitudinal Inserts" ,2000.
[2]. S. Naga Sarada1, A.V. Sita Rama Raju1, K. Kalyani Radha2*, L. Shyam Sunder1. Enhancement Of Heat Transfer Using Varying Width Twisted Tape Inserts. International Journal Of Engineering, Science And Technologyvol. 2, No. 6, 2010, Pp. 107-118.
[3]. Chinaruk Thianpong,Etal Heat Transfer And Thermal Performance Characteristics Of Heat Exchanger Tube Fitted With Perforated Twisted-Tapes. Heat Mass Transfer (2012) 48:881–892.
[4]. Bodius Salam, Sumana Biswas And Muhammad Mostafa Kamal Bhuiya. Heat Transfer Enhancement In A Tube Using Twisted Tape Insert. Proceedings Of The 13th Asian Congress Of Fluid Mechanics 17-21 December 2010, Dhaka, Bangladesh.
[5]. C. Thianponga, P. Eiamsa-Arda, P. Promvongea, S. Eiamsa-Ardb,* Effect Of Perforated Twisted-Tapes With Parallel Wings On Heat Transfer Enhancement In A Heat Exchanger Tube 2nd International Conference On Advances In Energy Engineering (ICAEE 2011).

Abstract: In the present work the cone-shaped valve at the hot end of existing model is replaced with a hollow cone-shaped valve gives a provision for passage through the inner core. A conical valve is introduced at the orifice, guide the forced vortex yet again to strike back evolve one more forced vortex flow, which escapes through the central core of the hollow cone-shaped valve. Thus the revised vortex tube with two forced vortex flows is named as dual forced flow vortex tube (DFFVT)......

Keywords: Vortex flow, COP, Temperature drop, End obstruction.

[1] Ranque, "Experiments on expansion in a vortex with simultaneous exhaust of hot air and cold air". Le journal de Physique et le Raiuum(paris)pp 112-114(1965) [2] R. Hilsch, The use of the expansion of gases in a centrifugal field as cooling process, Rev. Sci. Instrum. 18 (2) (1947) 108–113. [3] Ahlborn .B,Grooves.S, ".secondary flow in a vortex tube",Fluid dynanmics Res 21(2);pp73-86 (1997; [4] Behera U and Paul PJ (2005) CFD analysis and experimental investigation towards the optimizing the parameter of Ranque-Hilsch vortex tube. Int. J. Heat Mass Transfer. 48, 1961-1973. [5] Aljuwayhel, N. F., Nellis, G. F., Para met ric and In ter nal Study of the Vor tex Tube Us ing CFD Model, Int.J. Re frig er a tion, 28 (2005), 3, pp. 442-450