The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that 1) the concavity const...The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that 1) the concavity constructed on both side-walls of a diamond cylinder induces a substantial change in the flow patterns in the exit jet-stream field and jet- stream dispersion, 2) pressure characteristics are quantitatively measured in a diverging-flow region in diamond cylinder bundles with concavityand in its downstream region, and 3) flip-flop flow occurs in the flow passages and its occurrence condition is obtained.展开更多
Forced convection cooling of fins on a high-temperature wall has been used to cool high-power electronic devices. We numerically calculated and experimentally measured the forced convection heat transfer coefficient a...Forced convection cooling of fins on a high-temperature wall has been used to cool high-power electronic devices. We numerically calculated and experimentally measured the forced convection heat transfer coefficient and pressure drop of a diamond-shaped fin-array with water flow in this study, which had been reported to have a self-induced flip-flop flow phenomenon. Although the flip-flop flow phenomenon occurred in calculations, it was not observed in experiments. The heat transfer and pressure drop of the diamond-shaped fin-array could be estimated with equations for turbulent flow in tubes.展开更多
目的探讨皮下组织蒂菱形皮瓣成形术治疗烧伤后瘢痕挛缩的效果。方法选取2019年10月至2022年10月莆田市第一医院烧伤整形科收治的烧伤后瘢痕挛缩患者共100例,按治疗方式不同分成研究组(50例)与对照组(50例),对照组采用游离皮片移植术,研...目的探讨皮下组织蒂菱形皮瓣成形术治疗烧伤后瘢痕挛缩的效果。方法选取2019年10月至2022年10月莆田市第一医院烧伤整形科收治的烧伤后瘢痕挛缩患者共100例,按治疗方式不同分成研究组(50例)与对照组(50例),对照组采用游离皮片移植术,研究组采用皮下组织蒂菱形皮瓣成形术,统计两组术后1年皮瓣成活率、瘢痕挛缩复发率,比较两组生活质量[生活质量综合评定问卷(Generic Quality of Life Inventory-74,GQOLI-74)]、并发症。结果术后1年,研究组(100.00%)皮瓣成活率与对照组(92.00%)比较差异有统计学意义(P<0.05),研究组(4.00%)瘢痕挛缩复发率较对照组(18.00%)更低(P<0.05);两组术后1年GQOLI-74评分升高(P<0.05),研究组较对照组更高(P<0.05);研究组(4.00%)并发症发生率较对照组(24.00%)更低(P<0.05)。结论皮下组织蒂菱形皮瓣成形术治疗烧伤后瘢痕挛缩皮瓣成活率较高,可降低瘢痕挛缩复发率、生活质量提高,降低并发症发生风险。展开更多
文摘The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that 1) the concavity constructed on both side-walls of a diamond cylinder induces a substantial change in the flow patterns in the exit jet-stream field and jet- stream dispersion, 2) pressure characteristics are quantitatively measured in a diverging-flow region in diamond cylinder bundles with concavityand in its downstream region, and 3) flip-flop flow occurs in the flow passages and its occurrence condition is obtained.
文摘Forced convection cooling of fins on a high-temperature wall has been used to cool high-power electronic devices. We numerically calculated and experimentally measured the forced convection heat transfer coefficient and pressure drop of a diamond-shaped fin-array with water flow in this study, which had been reported to have a self-induced flip-flop flow phenomenon. Although the flip-flop flow phenomenon occurred in calculations, it was not observed in experiments. The heat transfer and pressure drop of the diamond-shaped fin-array could be estimated with equations for turbulent flow in tubes.
文摘目的探讨皮下组织蒂菱形皮瓣成形术治疗烧伤后瘢痕挛缩的效果。方法选取2019年10月至2022年10月莆田市第一医院烧伤整形科收治的烧伤后瘢痕挛缩患者共100例,按治疗方式不同分成研究组(50例)与对照组(50例),对照组采用游离皮片移植术,研究组采用皮下组织蒂菱形皮瓣成形术,统计两组术后1年皮瓣成活率、瘢痕挛缩复发率,比较两组生活质量[生活质量综合评定问卷(Generic Quality of Life Inventory-74,GQOLI-74)]、并发症。结果术后1年,研究组(100.00%)皮瓣成活率与对照组(92.00%)比较差异有统计学意义(P<0.05),研究组(4.00%)瘢痕挛缩复发率较对照组(18.00%)更低(P<0.05);两组术后1年GQOLI-74评分升高(P<0.05),研究组较对照组更高(P<0.05);研究组(4.00%)并发症发生率较对照组(24.00%)更低(P<0.05)。结论皮下组织蒂菱形皮瓣成形术治疗烧伤后瘢痕挛缩皮瓣成活率较高,可降低瘢痕挛缩复发率、生活质量提高,降低并发症发生风险。
