Thermal Analysis and Evaluation of Absorption Enhancement of Falling Film Type Absorber by Using a Multi-pulsed Laser Holography

多脉冲激光全息降膜型吸波体吸收增强的热分析与评价

• 批准号: 09650251
• 负责人: NISHIMURA Nobuya
• 金额: $ 2.05万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650251/
• 关键词: Absorption Refrigerator; Absorber; Plate Type Heat Exchanger; Absorption Enhancement; Surfactant; Marangoni Convection; Laser Holography; Multi-pulsed Laser; プレート型熱交換器; ベナ-ルセル; 界面かく乱; マルチパルスレーザ; レーザホログラフィ; 高速現象

Absorption enhancement technologies by using a surface active agent were developed, involving both statical and dynamical experiments on absorption enhancement mechanisms, as well as the establishment of guidelines for the development of high-performance absorbers.A first effort was made to visualize a Marangoni convection behavior with addition of n-octanol of LiBr aqueous solution in absorbers by a color high speed video camera (lOOOfps). Flow patterns of solution along the vertical direction were significantly different with and without n-octanol addition. When the surfactant was added, the film flow at the upper part of the absorber shows fully unconstructured chaotic behavior.A further effort was made to clarify the basic mechanism for the inducement of Marangoni convection in the process of steam absorption into the pooled absorption solution of LiBr with addition of n-octanol as surface active agent. Real time type laser holographic interferometry was used to visualize the trans … More ient phenomena occurred at/beneath the LiBr aqueous solution's surface in the very beginning(O-20msec) of steam absorption under vacuum condition(O.7kPa). Experiments were performed varying the initial surfactant concentration from 0 to 200ppm and the liquid layer thickness of 3*5mm. Without n-octanol addition, interference fringes were scarcely seen. When n-octanol was added, complicated shapes of interference fringes were seen in the entire surface. Pentagonal or hexagonal cell's patterns were observed at the surface clearly. And those cells evolved from small to large size instantly. Thereafter large scale chaotic eddies were induced at the surface.The results of this research indicated the following ; Addition of surfactant improves the refrigerating capacity about two times. Also the refrigerating capacity increases linearly with increasing of surfactant's concentration until its solubiity limit Vapor absorption from the absorbent surface is enhanced due to the occurrence of Marangoni convection in the thin falling film. Less

研究了基于表面活性剂的吸收增强技术，包括吸收增强机理的静态和动态实验，以及高性能吸收剂开发指南的建立。利用彩色高速摄像机（lOOOfps）首次观察了在吸收剂中加入正辛醇的LiBr水溶液的马兰戈尼对流行为。添加正辛醇和未添加正辛醇时，溶液沿垂直方向的流动模式有显著差异。当表面活性剂加入后，吸收体上部的膜流表现为完全非结构混沌行为。进一步阐明了加入正辛醇作为表面活性剂的LiBr池吸收液在蒸汽吸收过程中诱导Marangoni对流的基本机理。在真空（0.7 kpa）条件下，蒸汽吸收初期（0 ~ 20msec）， LiBr水溶液表面/下方发生了多瞬态现象。在初始表面活性剂浓度为0 ~ 200ppm，液层厚度为3*5mm的条件下进行了实验。未添加正辛醇时，干涉条纹几乎不可见。加入正辛醇后，整个表面出现了形状复杂的干涉条纹。表面可清晰地观察到五角形或六角形的细胞图案。这些细胞瞬间由小变大。此后，在表面产生了大规模的混沌涡流。本研究结果表明：表面活性剂的加入使制冷量提高了两倍左右。随着表面活性剂浓度的增加，制冷量呈线性增加，直到其溶解度极限为止，由于在降膜中发生马兰戈尼对流，从吸收体表面吸收蒸汽的能力增强。少

项目成果

野邑奉弘: "縦型管内吸収伝熱管の流下位置による吸収熱交換特性(界面活性剤添加の影響)" 平成10年度日本冷凍空調学会学術講演会講演論文集. 189-192 (1998)

野村义宏：“取决于垂直吸收传热管下游位置的吸收热交换特性（表面活性剂添加的影响）”日本制冷空调工程师学会1998年学术会议记录189-192（1998）。

NOMURA TOMOHIRO, NISHIMURA NOBUYA, IYOTA HIROYUKI, ISHIKAWA KIMIHIRO, SAKODA TETSUYA, OHASHI TOSHIKUNI: "Development of an Absorber of Falling Film Type along a Vertical Plate" Pro.of 1997 JSRAE Annual Conference. 41-44 (1997)

NOMURA TOMOHIRO、NISHIMURA NOBUYA、IYOTA HIROYUKI、ISHIKAWA KIMIHIRO、SAKODA TETSUYA、OHASHI TOSHIKUNI：“沿垂直板的降膜型吸收器的开发”Pro.of 1997 JSRAE 年会。

NISHIMURA NOBUYA, NOMURA TOMOHIRO, IYOTA HIROYUKI, MOTSUMOTO HIDEYUKI: "Vsualization of Marangoni Convection induced by Surfactant in LiBr Aqueous Solution" Proc.of the 26th Symposium on Visualization. 29-32 (1998)

NISHIMURA NOBUYA、NOMURA TOMOHIRO、IYOTA HIROYUKI、MOTSUMOTO HIDEYUKI：“LiBr 水​​溶液中表面活性剂诱导的 Marangoni 对流的可视化”第 26 届可视化研讨会论文集。

西村,野邑,伊與田,松本: "界面界性剤添加によりLiBr水溶液表面に生じるマランゴニ対流の可視化" 第26回可視化情報シンポジウム講演論文集. (1998)

Nishimura、Nomura、Iyoda、Matsumoto：“通过添加界面剂对 LiBr 水​​溶液表面产生的 Marangoni 对流进行可视化”第 26 届可视化信息研讨会论文集（1998 年）。

NOMURA TOMOHIRO, NISHIMURA NOBUYA, IYOTA HIROYUKI, NISHIYAMA TAKASHI: "Generation and Growth Process of Marangoni Convection in LiBr Aqueous Solution with Srufactant" Proc.of 1998 JSRAE Annual Conference. 193-196 (1998)

NOMURA TOMOHIRO、NISHIMURA NOBUYA、IYOTA HIROYUKI、NISHIYAMA TAKASHI：“含表面活性剂的溴化锂水溶液中马兰戈尼对流的生成和生长过程”1998 年 JSRAE 年会议程。