Numerical simulation of heat transfers on a circular cylinder by an impinging jet with nanofluid
Impinging jets are a best method of achieving particularly high heat transfer over a surface circular cylinder, flat plate and concave surface are subjects of interest in many research studies over the past decades. In terms of cooling surfaces in many engineering applications had been devised...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1456/ http://eprints.uthm.edu.my/1456/1/24p%20AYAD%20JASIM%20JABER%20AL-TALQANI.pdf http://eprints.uthm.edu.my/1456/2/AYAD%20JASIM%20JABER%20AL-TALQANI%20WATERMARK.pdf |
| Summary: | Impinging jets are a best method of achieving particularly high heat transfer over a
surface circular cylinder, flat plate and concave surface are subjects of interest in
many research studies over the past decades. In terms of cooling surfaces in many
engineering applications had been devised to enhance the heat transfer from the jet
impingement to the target surface.
In this work, a study was conducted to investigate numerically related to the
jet impingement on a circular cylinder. The objective of this study is to analyze the
form and nature of the distribution of heat transfer on the surface of a circular
cylinder are bombarded with water and "nanofluid" as a fluid jet. Increase the
heat transfer rate by using three types of "nanofluids"namely,(water+Al2O3),
(water+ CuO) and (water + SiO2) as a fluid jet impingement also studied..
Effects of different Reynolds numbers (Red) in based nozzle different the
ranges of (10000-30000) the performance of jet impingement heat transfer using a
water jet impingement will be compared with that using "nanofluids" as the working
fluid. Simulations are carried out in the form of dimensional (3-D) and in a "steady
state" by using ANSYS 14.0 software that has been commercialized in the market.
The results obtained from numerical simulations of jet impingement cooling
the cylinders on the heated cylindrical tube will be presented. Heated surface of the
cylinder tube will be maintained in a state of "Konstant heatflux". Geometric
parameters such as the non-dimensional distance between the tip "nozzle" and the
surface of the cylinder tube (h / d) was investigated in the amount of 4.8 and
12.Variasi Nusselt numbers (Nud) along the circumferential and axial directions
obtained from this study will be reported along with numerical the flow
characteristics of jet impingement. It has been observed mainly in the areas of impact
that Nud increased when h/d decreases. (Nud) increased by 21% when the distance
ratio h/d = 4 compared with the distance ratio h/d = 12. |
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