The development of high-performance thermal systems has stimulated interest in methods to improve heat transfer. Tubes with artificial roughness obtained by providing dimples on the tube surface are competitive in comparison to performance and cost of other enhanced techniques currently employed in turbulent flow.
In this study forced convection heat transfer characteristics from dimpled tube has been investigated experimentally. The effect of variation in dimple diameter and dimple arrangement (inline and staggered) has been investigated for Reynolds No range 12000 to 26000 dimpled tube. Additionally the effect of variation in dimple tube and diameter on pressure drop across test section has also been investigated. This investigation was carried out to observe if the use of dimples on tube can enhance heat transfer characteristics without severe penalties associated with pressure drops for turbulent flow.
The results show that heat transfer enhancement under forced convection can be achieved by using dimple tubes. The enhancement in convective heat transfer coefficient is observed as 18% and in Nusselt number as 22 % as compared with plain tube for same Reynolds number. The thermal performance factor values for the staggered dimpled array geometry were more than corresponding inline dimpled array geometry in the Reynolds number range studied
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Mechanical Engineering, J. S. P. M’s Rajarshi Shahu College Of Engineering, Savitribai Phule Pune University, Pune, India.
Mooring line have several types of material which is chain, wire and synthetic fiber rope. Mostly, in oil and gas industry is use chain and wire rope as a mooring line for shallow water platform. When exploitation of oil and gas become deep, synthetic fiber is use as an alternative for mooring line. This paper focused on types of material and experimental by previous researcher for deep water mooring line. Beside that, the tensile test have been done for preliminary design stage. The test is to identify the material properties of mooring line. At this stage only focus on the steel wire rope with length 200mm and nominal diameter 2mm, 2.5mm, 6mm and 8mm. Finally, the conclusion and important summaries were presented according to the data collected.
Department of Aeronautical, Automotive and Ocean Engineering, University Teknologi Malaysia, Johor Bahru, Malaysia
Ocean and Aerospace Engineering Research Institute, Indonesia
