بررسی عددی تأثیر جهت جریان بر برداشت انرژی از ارتعاش القایی در یک استوانه نیمه دایره ای گرم با قطاع
پذیرفته شده برای ارائه شفاهی ، صفحه 1-8 (8) XML اصل مقاله (612.99 K)
نویسندگان
1گروه آموزشی مکانیک
2گروه مکانیک دانشگاه خیام
3مهندسی مکانیک دانشکاه خیام
چکیده
In the presence of buoyancy, a two-dimensional computer simulation explores flow and heat around low-mass arched forebodies (AF), flat forebodies (FF), and circular cylinders (CC). The Prandtl number of 0.71, the Reynolds number of 100, and the Richardson number of 1.5 are all used in this investigation. Selecting five semi-circular cylinders with various length-to-diameter ratios (L*=L/D) aims to investigate the influence of L* on energy harvesting. Our goal is to determine a bluff body that captures maximum energy through more vibration. Having compared some of the outcomes of present work with other studies, a good agreement is achieved to validate the simulations. Energy harvesting is augmented when Richardson numbers are prescribed higher. Not having applied buoyancy force, the circular cylinders with L* of 0.5 and 0.6 for the flat forebody configuration gain the highest extracted power at Reynolds numbers of 100 and 200, respectively, resulting in 3.5 and 5.3 more times extracted power. Moreover, the flat forebody configuration always brings about more harvested energy compared to the same body with opposite flow direction. As a result of these findings, we can gain a deeper understanding of the characteristics of thermal systems able to dissipate heat loads as well as produce maximum power output.
کلیدواژه ها
 
Title
Numerical study of the Impact of the Flow Direction on Energy Harvesting from Induced Vibration in a Heated Semi-Circular Cylinder
Authors
Ebrahim Barati, Mehdi Rafati, Mohsen Biabani
Abstract
In the presence of buoyancy, a two-dimensional computer simulation explores flow and heat around low-mass arched forebodies (AF), flat forebodies (FF), and circular cylinders (CC). The Prandtl number of 0.71, the Reynolds number of 100, and the Richardson number of 1.5 are all used in this investigation. Selecting five semi-circular cylinders with various length-to-diameter ratios (L*=L/D) aims to investigate the influence of L* on energy harvesting. Our goal is to determine a bluff body that captures maximum energy through more vibration. Having compared some of the outcomes of present work with other studies, a good agreement is achieved to validate the simulations. Energy harvesting is augmented when Richardson numbers are prescribed higher. Not having applied buoyancy force, the circular cylinders with L* of 0.5 and 0.6 for the flat forebody configuration gain the highest extracted power at Reynolds numbers of 100 and 200, respectively, resulting in 3.5 and 5.3 more times extracted power. Moreover, the flat forebody configuration always brings about more harvested energy compared to the same body with opposite flow direction. As a result of these findings, we can gain a deeper understanding of the characteristics of thermal systems able to dissipate heat loads as well as produce maximum power output.
Keywords
Buoyancy force, Flow- induced vibration, Energy harvesting