Showing papers on "Heat transfer enhancement published in 1983"
01 Jun 1983
TL;DR: In this article, the authors consider the effects of associated flow friction changes when satisfying design goals such as reducing the size of a heat exchanger required for a specified heat duty, upgrading the capacity of an existing exchanger, reducing the approach temperature difference, or reducing the pumping power.
Abstract: Energy and material savings considerations, as well as economic incentives, have led to recent expansion of efforts to produce more efficient heat exchange equipment. Increased convective heat transfer coefficients, with or without surface area increases, are vital to these efforts. Associated flow friction changes must be considered when satisfying design goals such as reducing the size of a heat exchanger required for a specified heat duty, upgrading the capacity of an existing exchanger, reducing the approach temperature difference, or reducing the pumping power.
39 citations
25 Mar 1983
TL;DR: In this article, the authors show that 23% of the users' responses were negative, while only 5% were positive, and only 3% reported positive responses for the majority of users.
Abstract: タービュレンス・プロモータ(乱れ促進体)を用いた強制対流熱伝達の促進法について実験的研究を行った.検討の結果,空孔率が23%前後の多孔板プロモータ(薄い鋼版に直径2mm程度の穴をあけたもの)を流れに直角に配置した伝熱面の総合性能(流動・伝熱の両方を配慮)がほかよりも優れていることを確認した.また伝熱・流動測定と併行して流れの可視化を行い,多孔板プロモータによる伝熱促進機構を定性的に明らかにした.
7 citations
Journal Article•
TL;DR: In this article, a mechanism of promoting heat transfer, by which a remarkably high heat flux is obtained with a heat source having a small temperature difference is elucidated, which consists of generating a small amount of electrolytic hydrogen gas from a heating surface undergoing nucleate boiling and natural convection.
Abstract: A mechanism of promoting heat transfer, by which a remarkably high heat flux is obtained with a heat source having a small temperature difference is elucidated. The method consists of generating a small amount of electrolytic hydrogen gas from a heating surface undergoing nucleate boiling and natural convection. Photographs of a boiling process in the presence of electrolytic hydrogen gas evolution from the heating surface were taken. By analyzing high-speed motion pictures it is shown that the electrolytic hydrogen gas permits vapor bubble production with a small degree of superheat and increases the number of vapor bubble nuclei.
2 citations
01 Jan 1983
TL;DR: In this paper, the coefficient de transfert de chaleur global au moyen de tubes a cannelures exterieures et interieures is augmented by augmenting the coefficient.
Abstract: Coefficients de transfert de chaleur des films tombants en evaporation sur des surfaces verticales cannelees, et des films se condensant sur une surface verticale cannelee. Augmentation du coefficient de transfert de chaleur global au moyen de tubes a cannelures exterieures et interieures
2 citations
TL;DR: In this paper, the mean heat transfer characteristics of the oscillatory cavity flow are derived and discussed, and the unsteady fluid motion driven in a square cavity by the combined effects of a vibrating wall and natural convection is examined.
1 citations