International Journal of Technology and Innovation

International Research Journal of Mechanical Engineering Vol.  3 (5) pp. 317-320, May, 2015.  © International Scholars Journals

Full Length Research Paper

Construction of chain sampling plan-1 indexed through producer’s nano quality level and consumer’s nano quality level

*Prakash M. Kamal, Humayun Hossain and Ahmed Ali Bogra

Department of Mechanical Engineering, Daffodil International University, Dhaka, Bangladesh.

E-mail: [email protected].

Accepted 20 April, 2014

Abstract

Motorola (1980) introduced the concept of “six sigma” as a quality philosophy and a management strategy, which when adopted in a system of organization will reduce wastages, increase the profit to the management and enhance the satisfaction of the customer. If this concept of six sigma is adopted in an organization it can results in 3.4 or less number of defects per million opportunities in the long run. In recent days in developed and developing countries more and more organization started working beyond six sigma level and thereby the performance level increases with number of defectives reduced to near zero level. In this paper a new procedure for the construction of chain sampling plan-1(ChSP-1) indexed through producer’s nano quality level (PNQL) and consumer’s nano quality level (CNQL) is introduced and suitable tables are provided for the easy selection of the plan.

Key words: Nano quality level, Poisson distribution, chain sampling plan, Operating Characteristic (OC) curve, six sigma quality level.

International Research Journal of Mechanical Engineering Vol.  3 (5) pp. 313-316, May, 2015. © International Scholars Journals

Review

Assessment of fiberglass fortified plastic and rapid cooling tower

Avicenna E. saadi

Department of Mechanical Engineering, Islamic Azad University of Mashhad, Mashhad, Iran.

Email: prof.saadi07@yahoo.

Accepted 12 April, 2015

Abstract

An evaluation of applicable materials for an industrial cooling tower is presented in this study. Advantages and disadvantages of different sets of materials including reinforced concrete and FRP (Fiber-Reinforced Polymer Composites) for cooling tower structure are discussed. After evaluating each material characteristic, the one case study of cooling tower is considered for cost estimation. The results showed that the FRP is best structural material for cooling tower construction mainly due to its superior performance in sea water corrosive environment. From the economical point of view, although the construction cost FRP structure is a little higher, this can be easily balanced by less maintenance costs of FRP structure considering its high durability in hostile environments.

Key words: Fiber-reinforced polymer composites (FRP) cooling tower, concrete cooling tower, polyvinyl chloride (PVC) fills.

International Research Journal of Mechanical Engineering Vol.  3 (4) pp. 305-312, April, 2015.  © International Scholars Journals

Full Length Research paper

Analysis on friction factor and temperature profiles of liquid stream in circular microchannels

*Vankam I. E, Vijay M. I and Nadeem Singh

Department of Mechanical Engineering, Himachal Pradesh University, Shimla, India.

E-mail: [email protected]

Accepted 19 March, 2015

Abstract

Heat dissipation in electronic components becomes an important issue in efficiency promotion and stable operation. Microchannel heat exchanger plays the major role for heat dissipation from such high heat generating electronic components. In this connection an experimental investigation was conducted to explore the validity of classical correlations of friction factor based on conventional sized channels for predicting the fluid behavior in single-phase water flow through circular microchannels. The microchannels under investigation have the hydraulic diameter of 279 µm and 45 mm long. Test piece was made of stainless steel and the test section contained a total of seventy nine microchannels arranged in circumferential manner. The experiments were conducted with deionized water of Reynolds number ranging from approximately 300 to 3000. Pressure drop and flow rates were measured to analyze the flow characteristics. The results show good agreement between the classical correlations of friction factor and the experimentally measured data. The temperature profiles along as well as across the channels shows that channel length and channel diameter play the major role on its behavior.

Key words: Microchannels, friction factor, temperature profiles.

International Research Journal of Mechanical Engineering Vol.  3 (3) pp. 294-304, March, 2015. © International Scholars Journals

Full Length Research paper

 Probabilistic assessment of performance point in structures and examination of the instabilities

*Mehran Satrapi, Abbas F. Jobrani and Majid Amanpour

Department of Civil Engineering, Allameh Tabataba'i University,Tehran, Iran.

E-mail: [email protected].

Accepted 21 February, 2014

Abstract

The main goal of the performance based design of structures is to rationally predict the structures’ performance during earthquakes which may occur during the lifetime of the structure. In this sort of design, a specific displacement is defined as target displacement and the structure is subjected to a force in order to reach this target displacement. This design process includes uncertainties in loading, materials and analysis methods of the performance point. Therefore, statistical and probabilistic analysis should be considered. In this paper, uncertainty sources for determining the performance point are defined and then the procedures suggested in the codes are introduced. In the next step, an appropriate probability distribution function is defined for uncertainty parameters and finally the performance point of the structure is determined regarding these parameters in accordance with the codes. In addition, the sensitivity of the performance point with respect to the mentioned parameters is investigated. Results indicate that sensitivity of the performance point to geometric characteristics is of great importance and other parameters such as dead and live load stand in the second level in terms of sensitivity. An appropriate lateral loading pattern with the least uncertainty is also proposed for buildings.

Key words: Performance level, performance point, probabilistic design, uncertainty, sensitivity analysis.

International Research Journal of Mechanical Engineering Vol.  3 (1) pp. 280-283, January, 2015. © International Scholars Journals

Full Length Research Paper

Investigation of the short and long weariness breaks for metal combination

*Hisham E. Zaha, Kadim T. Aziz and Ali Usama Kahraman

Mechanical Engineering Department, College of Engineering, University of Baghdad, Baghdad, Iraq.

E-mail: [email protected]

Accepted 20 December, 2014

Abstract

In this study the effect of short and long cracks for brass alloys specimens exposed to bending cyclic load is investigated, this test applied on a group of standard specimens until its fracture, data taken could be drawn as a curve between stress and number of cycles (S-N) curves which gives the fatigue limit. Results obtained theoretically and experimentally, that are concluded decreasing in the applied load cause increasing the age and applying high loads in the beginning and at the end given almost smaller number specimen age and the quick growth of short cracks followed by quick growth of long cracks, that the values taken from the theoretical equations are always greater than experimental number of cycles of failure.

Key words: Fatigue, varying loads, short cracks, long cracks, brass alloy.