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Turbulent Heat Transfer From an Isothermal Half-Cylinder Positioned Parallel to Airflow.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Turbulent Heat Transfer From an Isothermal Half-Cylinder Positioned Parallel to Airflow./
作者:	Rarick, Nathan A.
面頁冊數:	1 online resource (34 pages)
附註:	Source: Masters Abstracts International, Volume: 84-11.
Contained By:	Masters Abstracts International84-11.
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798379535827

Turbulent Heat Transfer From an Isothermal Half-Cylinder Positioned Parallel to Airflow.
Rarick, Nathan A.

Turbulent Heat Transfer From an Isothermal Half-Cylinder Positioned Parallel to Airflow. - 1 online resource (34 pages)

Source: Masters Abstracts International, Volume: 84-11.

Thesis (M.S.)--Southern Illinois University at Edwardsville, 2023.

Includes bibliographical references

Turbulent heat transfer and fluid flow characteristics for an isothermal half-cylinder oriented parallel to a uniform flow are investigated numerically. The broad applications of heat transfer from cylinders provide a compelling background for examining a related geometry, the half-cylinder (or semicircular cylinder). While plenty of works examine heat transfer with full cylinders, especially those in crossflow, relatively few explore the heat transfer of half-cylinders. This paper seeks to correlate the Nusselt number results from the full cylinder to that of the half-cylinder and present the local and average heat transfer on the isothermal faces of the half-cylinder. The thermal design of devices resembling the half-cylinder and experiencing a parallel external flow relies on such data. The half-cylinder, which has a length-to-diameter ratio of one, is compared to full cylinders of similar dimensions. The computational results of the local and average heat transfer coefficients are compared with the available experimental data and previous computational results, which validate the current results. Other points of comparison originate from previous experimental data of the front faces of circular discs in similar axial flow orientations. Though not strictly identical, the current results agree with full cylinder axial flow analysis in that the convective heat transfer coefficient increases to its maximum towards the edge of the front face. Computations are carried out over a range of Reynolds numbers from 5,000 to 42,000, using air as the working fluid. Results showing the distribution of the convective heat transfer coefficient across each face are presented and show the influences attributed to flow separation, flow recirculation, and the rear wake region. The site of the stagnation point on the front face is located, and the Nusselt number at that location is compared with prior experimental results. No vortex shedding was observed, and a steady state flow condition was determined, contrary to that seen in full cylinders in cross flow. A detailed grid study demonstrates the independence of the results from mesh refinement. The k-w SST turbulence model is implemented as adverse pressure gradient situations are expected. Contour plots of heat flux and plots of the local and average Nusselt numbers are provided as results. Additionally, figures showing the surrounding flow fields are exhibited, providing a perspective of their involvement with the surfaces of the half-cylinder. These flow features are discussed and compared to those found in full cylinders. A varied and complicated flow field affecting the turbulent heat transfer from the half-cylinder is revealed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379535827Subjects--Topical Terms:

557493
Mechanical engineering.
Subjects--Index Terms:

Turbulent heat transferIndex Terms--Genre/Form:

554714
Electronic books.

Turbulent Heat Transfer From an Isothermal Half-Cylinder Positioned Parallel to Airflow.
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520 $a Turbulent heat transfer and fluid flow characteristics for an isothermal half-cylinder oriented parallel to a uniform flow are investigated numerically. The broad applications of heat transfer from cylinders provide a compelling background for examining a related geometry, the half-cylinder (or semicircular cylinder). While plenty of works examine heat transfer with full cylinders, especially those in crossflow, relatively few explore the heat transfer of half-cylinders. This paper seeks to correlate the Nusselt number results from the full cylinder to that of the half-cylinder and present the local and average heat transfer on the isothermal faces of the half-cylinder. The thermal design of devices resembling the half-cylinder and experiencing a parallel external flow relies on such data. The half-cylinder, which has a length-to-diameter ratio of one, is compared to full cylinders of similar dimensions. The computational results of the local and average heat transfer coefficients are compared with the available experimental data and previous computational results, which validate the current results. Other points of comparison originate from previous experimental data of the front faces of circular discs in similar axial flow orientations. Though not strictly identical, the current results agree with full cylinder axial flow analysis in that the convective heat transfer coefficient increases to its maximum towards the edge of the front face. Computations are carried out over a range of Reynolds numbers from 5,000 to 42,000, using air as the working fluid. Results showing the distribution of the convective heat transfer coefficient across each face are presented and show the influences attributed to flow separation, flow recirculation, and the rear wake region. The site of the stagnation point on the front face is located, and the Nusselt number at that location is compared with prior experimental results. No vortex shedding was observed, and a steady state flow condition was determined, contrary to that seen in full cylinders in cross flow. A detailed grid study demonstrates the independence of the results from mesh refinement. The k-w SST turbulence model is implemented as adverse pressure gradient situations are expected. Contour plots of heat flux and plots of the local and average Nusselt numbers are provided as results. Additionally, figures showing the surrounding flow fields are exhibited, providing a perspective of their involvement with the surfaces of the half-cylinder. These flow features are discussed and compared to those found in full cylinders. A varied and complicated flow field affecting the turbulent heat transfer from the half-cylinder is revealed.
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