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Experimental investigations into fre...
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Liu, Yen-Chung.
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Experimental investigations into free-circular upward-impinging oil-jet heat transfer of flat plates and automotive pistons.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Experimental investigations into free-circular upward-impinging oil-jet heat transfer of flat plates and automotive pistons./
作者:
Liu, Yen-Chung.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:
242 p.
附註:
Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
Contained By:
Dissertation Abstracts International78-02B(E).
標題:
Mechanical engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10169507
ISBN:
9781369237009
Experimental investigations into free-circular upward-impinging oil-jet heat transfer of flat plates and automotive pistons.
Liu, Yen-Chung.
Experimental investigations into free-circular upward-impinging oil-jet heat transfer of flat plates and automotive pistons.
- Ann Arbor : ProQuest Dissertations & Theses, 2016 - 242 p.
Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
Thesis (Ph.D.)--Oakland University, 2016.
The purpose of this research was to measure and correlate the area-average heat transfer coefficients for free, circular upward-impinging oil jets onto a flat plate and also onto two automotive pistons having different undercrown shapes and different diameters. This research included flow observations of the impinging oil jets onto a glass plate in order to characterize the flow and the impingement areas. The observations identified three flow regimes: a high Prandtl number, low Reynolds number regime characterized by a conical oil film dripping downward from the surface; a low Prandtl number, low Reynolds number regime in which the conical films breaks into separated streams; and a low Prandtl, high Reynolds number regime in which an air-entrained oil jet contacts the surface and forms an irregular two-phase contact area. An image processing technique was used to measure the oil jet impingement areas and to determine the effective impingement diameters, which were successfully correlated to a function of the Reynolds, Prandtl and Bond numbers.
ISBN: 9781369237009Subjects--Topical Terms:
649730
Mechanical engineering.
Experimental investigations into free-circular upward-impinging oil-jet heat transfer of flat plates and automotive pistons.
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The purpose of this research was to measure and correlate the area-average heat transfer coefficients for free, circular upward-impinging oil jets onto a flat plate and also onto two automotive pistons having different undercrown shapes and different diameters. This research included flow observations of the impinging oil jets onto a glass plate in order to characterize the flow and the impingement areas. The observations identified three flow regimes: a high Prandtl number, low Reynolds number regime characterized by a conical oil film dripping downward from the surface; a low Prandtl number, low Reynolds number regime in which the conical films breaks into separated streams; and a low Prandtl, high Reynolds number regime in which an air-entrained oil jet contacts the surface and forms an irregular two-phase contact area. An image processing technique was used to measure the oil jet impingement areas and to determine the effective impingement diameters, which were successfully correlated to a function of the Reynolds, Prandtl and Bond numbers.
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From the flat plate heat transfer studies, two empirical area-average Nusselt number correlations were developed; one based on the whole flat plate underside surface area with the Nusselt number based on the nozzle diameter, and the other based on the oil jet impingement area with the Nusselt number based on the oil jet effective impingement diameter. The correlations can predict 98% and 97% of the experimental measurements within 30% error, respectively.
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For the piston heat transfer studies, two empirical area-average Nusselt number correlations were developed. Again, one was based on the whole piston undercrown surface area with the Nusselt number based on the nozzle diameter, and the other was based on the oil jet impingement area with the Nusselt number based on the oil jet effective impingement diameter. The correlations can predict the 95% and 94% of the experimental measurements within 30% error, respectively. The first correlation is simpler to use and can be employed for cases in which the oil jet wets the whole piston undercrown. The latter may be more useful for larger pistons or higher Prandtl number conditions in which the oil jet wets only a portion of the undercrown.
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