Pressure-driven Flow Instability with Convective Heat Transfer through a Rotating Curved Square Duct with Strong Curvature
Journal Title: Current Journal of Applied Science and Technology - Year 2017, Vol 23, Issue 2
Abstract
The present paper investigates pressure-driven flow instability with convective heat transfer through a rotating curved square duct with curvature ratio 0.5. Spectral method is used as a basic tool to solve the system of non-linear partial differential equations. The outer wall of the duct is heated while the inner wall cooled, the top and bottom walls being thermally insulated. The duct is rotated in both the positive and negative direction, and investigated combined effects of centrifugal, Coriolis and buoyancy forces. For positive rotation, the unsteady flow characteristics are investigated for the Taylor number , and it is found that the multi-periodic flow turns into chaotic flow through various flow instabilities, if Tr is increased in the positive direction. For negative rotation, however, time-dependent flow behavior is investigated for , and it is found that the multi-periodic flow precisely turns into steady-state flow, if Tr is increased in the negative direction. Streamlines and isotherms are also obtained, and it is found that the unsteady flow consists of asymmetric 2- to 6-vortex solutions. The present study shows that the convection due to the secondary flow, enhanced by the combined action of the centrifugal-Coriolis-buoyancy forces, increases heat transfer significantly from the heated wall to the fluid, and whenever the flow becomes periodic and then chaotic, as Tr increases, the rate of heat transfer increases remarkably.
Authors and Affiliations
Md. Arifuzzaman, Muhammad Minarul Islam, Sanjit Kumar Paul, Rabindra Nath Mondal
Keywords
Related Articles
- EP ID EP318376
- DOI 10.9734/CJAST/2017/31612
- Views 77
- Downloads 0
Design and Development of Power Operated Rotary Weeder for Rice
Weeds are serious problem in all crops but they are even more so in “kharif” crops. For weed problem several study and research work has carried out for its effective control and measure by...
Evaluation of Quantitative Characters of Okra [Abelmoschus esculentus (L). Moench] Genotypes
The present investigation was carried out to evaluate the quantitative characters of different genotypes of okra planted in plot size of 5.40 m2 with the spacing of 60 X 30 cm. Observations were recorded on plant height,...
What’s the Benefit of Adaptation to Climate Change? Application of Partial Budgeting for the Rice Growers of Eastern Himalaya in India
The objective of the present study was to estimate the cost of adaptation to climate change incurred by the rice growers in Eastern Himalaya (EH) in India. A sample total of 120 cereal farmers were surveyed in Senapati d...
Effect of Ascending an Inclined Surface versus Backward Walking on Flat Surface on Dynamic Balance in Healthy Older Adult Males
Aims: Falls among elderly are major health problem. Practice of physical activities such as walking on regular basis improves balance and reduces falls. The objective of this study was to determine whether ascending an...
Risks Associated with Radio-frequency Radiation Exposure at Close Proximities to Mobile Phone Base Stations in Port Harcourt, Rivers State, Nigeria
This paper evaluates risks associated with Radio-frequency radiation exposure at close proximities to Mobile Phone Base Stations in Port Harcourt, Rivers State, Nigeria. It involved the use of RF field strength meter, a...