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Item Stability theory and experiments in wall-turbulence(7-Apr-2012) P.K. Sen*, S. V. Veeravalli and Ganapati JoshiDrag reduction is one of the most important areas of research. The main concept behind drag reduction is turbulence control. This could possibly be achieved in near wall turbulent flow by suppressing wall-mode instabilities (i.e., by interfering with the seeding mechanism of turbulence production). Wall-mode instabilities can be studied by applying hydrodynamic stability theory to wall bounded turbulent flows. It has been shown in Sen & Veeravalli, 2000 (Sadhana, 25, 423-437) that an anisotropic eddy viscosity model is crucial in capturing the wall mode instabilities. The main results of this theory are discussed and we present detailed experimental investigations carried out with the objective of verifying the Sen & Veeravalli theoryItem A review of flow and heat transfer in rotating microchannels(IUT, Gazipur, 2-Mar-2012) Pratanu Roya, N.K. Ananda,*, Debjyoti BanerjeeaRotating microchannels are integral part of centrifugally actuated miniaturized microfluidic devices, which have important applications in chemical analysis and biomedical diagnostics. As the field of centrifugal microfluidics continues to evolve, it is becoming imperative to understand the fundamental principles of fluid flow inside microchannels under the influence of centrifugal and Coriolis forces. These forces arise as a consequence of expressing the governing equations in rotating Eulerian reference frame and change the flow pattern significantly from the symmetric parabolic profile of a non-rotating channel. In this paper, we have summarized the recent advances in the area of fluid flow and heat transfer applications in radially rotating microchannels. A review of experimental and numerical studies available in the current literature is performed and issues with the applicability of analytical correlations for conventional macro-sized channels to describe the microscale flow phenomena have been discussed. From this state of the art review, it is evident that further systematic investigations are needed for a clear understanding of the transport mechanism associated with the flow and heat transfer inside rotating microchannels.Item The Influences of the Burnable Absorber (UO2+Gd2O3) on VVER-1200 Fuel Assembly(Department of Mechanical Engineering, KUET, 19-Dec-2020) Pramanik, Md Masum Rana; Hridoy, Monowar WadudBurnable absorber rods (UO2+Gd2O3) and chemical shim are the main control poisons that are used in the core for improvingItem Heterogeneous Structure in Diesel Fuel Sprays(7-Apr-2012) Hironobu UekiaA laser 2-focus velocimeter (L2F) has been applied for measurements of velocity and size of droplets in diesel sprays. The maximum data acquisition rate of 15 MHz has been achieved by using FPGA in order to capture every droplet which appears in the micro-scale measurement volume. A method of evaluating the mass flow rate of droplets was proposed, and the distance between droplets was adopted as an indicator of the number density of droplets and the heterogeneous structure of sprays. The diesel fuel spray was injected intermittently into the atmosphere by using a 5-hole injector nozzle. The orifice diameter of the injector nozzle was 0.113 mm, and the injection pressure was set at 40MPa by using a common rail system. Measurements were conducted in the spray on 10 planes from 5 to 25 mm downstream from the nozzle exit. It was shown that the velocity of droplet was the highest at the spray center and decreased towards the spray periphery. The size of droplet at the spray center decreased downstream and that at spray periphery increased downstream. The mass flow rate near the spray center was larger than that in the spray periphery region. It was confirmed that the fuel mass per injection evaluated by the proposed method based on the L2F measurement was nearly equal to the injected mass in a plane further than 15 mm from the nozzle exit. The probability density of droplet with a distance shorter than 5 m to the adjacent droplet increased remarkably near the spray center 5 and 12 mm downstream from the nozzle exit. It is thought that a region of high number density of droplet exists at the spray center near the spray tip when the spray penetration is shorter than 15 mm.Item Experimental Investigation on Traditional Fan Performance Improvement using Front Mounted Cooling Coil of Vapor Compression Refrigeration System(Department of Mechanical Engineering, KUET, 19-Dec-2020) Hridoy, Monowar Wadud; Mohammad, Mahathir; Islam, Saiful; Hakim, Md. Masbah-Ul; Kadir, C.H.M ImranThe temperature of the world is increasing day by day and the effects of this warming are influential in Bangladesh. AItem Experimental Analysis of Heat Transfer Improvement of Water Utilizing Double Counter Twisted Tape Insert(Department of Mechanical Engineering, KUET, 19-Dec-2020) Hridoy, Monowar Wadud; Khan, Shawkut Ali; Ahmad, Rana; Rahman, Md. Abdur; Kadir, C.H.M. ImranThis investigation was done for improving tube side heat transfer execution by double counter twisted tape insert. The testItem Design and Cost Estimation of an Economic Air Blast Freezer(Department of Mechanical Engineering, KUET, 19-Dec-2020) Hridoy, Monowar Wadud; Hossan, Md. Nahid; Kadir, C.H.M. Imran; Sarkar, Deepok Kumar; Ahmad, RanaAir blast freezer is the technology of rapidly freezing food to its desired storage temperature. This quick-freezing form veryItem The 3rd International Conference on Mechanical, Industrial and Energy Engineering (ICMIEE-2014)(Khulna University of Engineering & Technology, 22-Dec-2014) KUET, Dept. of Mechanical Engineering