Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: II- Effect of attack angle | ||||
| Engineering Research Journal (Shoubra) | ||||
| Volume 50, Issue 1, October 2021, Page 77-85 PDF (1.26 MB) | ||||
| Document Type: Research articles | ||||
| DOI: 10.21608/erjsh.2021.226112 | ||||
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| Authors | ||||
| A. A. Alghrubah; M. ِA.Abd Elrahman | ||||
| Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Shoubra, Cairo, Egypt | ||||
| Abstract | ||||
| Bundles of tubes in cross flow are one of the frequently types of heat exchangers, which used in several applications. Therefore, enhancing their performance directly affects the working costs. In the present work, a pair of semicircular tubes (SCTs) is suggested to replace complete circular tube (CCT). Their performance attributes are examined for staggered tube bundle at several rates of airflow across the bundle and at several attack angles of their bases; from zero to 90. It is reported that splitting the CCTs enhances the heat exchange rate as well growing the airflow resistance. Besides, increasing the base angle between 0 and 60 increases both the heat exchange and flow resistance. Their supreme increases are 105.1% and 47.4%, respectively, are obtained at 60 when compared with regular shape. While after 60 and below 90, increasing the angle reduces these increases. The hydrothermal performance Indicator (HTPI) is presented to weigh the performance qualities. It is reported that HTPI is augmented by increasing the angle until 60 while it is constricted with increasing the angle after 60. | ||||
| Keywords | ||||
| Staggered; Semi-circular tube; Base attack angle; Performance | ||||
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