摇摆条件下过渡区换热特性研究
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- 英文论文题名：Study on heat transfer in transitional regime under rolling motion
- 论文作者：袁红胜 ; 兰述 ; 庄乃亮 ; 谭思超
- 英文论文作者：YUAN Hong-sheng ; LAN Shu ; ZHUANG Nai-liang ; TAN Si-chao ; Fundamental Science on Nuclear Safety and Simulation Technology Laboratory ; Harbin Engineering University ; Dongfang Turbine Co. ; Ltd
- 年：2015
- 作者机构：哈尔滨工程大学核安全与仿真技术国防重点学科实验室;东方汽轮机有限公司;
- 论文关键词：对流换热 ; 过渡区 ; 流量波动 ; 摇摆条件
- 英文论文关键词：convective heat transfer ; transitional regime ; flow rate fluctuation ; rolling motion
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第3册（核能动力分卷（下））
- 语种：中文
- 分类号：TL33
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：5
- 文件大小：215k
- 原文格式：O
- 会议级别：全国
摘要
本文对摇摆条件下过渡区的单相流动换热特性进行了实验研究。实验段入口温度和压力分别为30℃和0.4 Mpa,不同雷诺数下保持平均出口温度分别为50℃、60℃、70℃和80℃。实验结果表明,随着摇摆条件下回路流量的波动,层流区平均努塞尔数有所减小,而过渡区平均努塞尔数系数则增大,且随摇摆频率和摇摆振幅越大,该趋势更加越明显。紊流工况下,由于流量波动较小,平均努塞尔数与稳态工况基本一致。通过分析发现,流动在过渡区附近出现的跨区现象、过渡区内努塞尔数随雷诺数的变化规律、流动加减速和进出口温差对转捩雷诺数的影响是平均努塞尔数发生变化的原因。
An experimental study was conducted in a heated rectangular channel on a rolling platform to investigate heat transfer in laminar-turbulent transition regime under rolling motion.The experiments were conducted for average outlet temperatures of 50 ℃,60℃,70 ℃ and 80 ℃ and inlet temperature of 30 ℃ and a system pressure of 0.4 Mpa remained unchanged.The results show that the average Nusselt number is a little smaller in the laminar region but higher in the transitional region than that of the steady flow under the same average Reynold number.Being the same trend with relative flow rate fluctuation,larger increment of frictional resistance was observed under higher rolling frequency and amplitude.Two main reasons were found and analyzed for the enhancement of heat transfer.They are cross region phenomenon,variation of Nusselt number with Reynolds number in transition region and effects of acceleration and outlet temperature on critical Reynolds number.
An experimental study was conducted in a heated rectangular channel on a rolling platform to investigate heat transfer in laminar-turbulent transition regime under rolling motion.The experiments were conducted for average outlet temperatures of 50 ℃,60℃,70 ℃ and 80 ℃ and inlet temperature of 30 ℃ and a system pressure of 0.4 Mpa remained unchanged.The results show that the average Nusselt number is a little smaller in the laminar region but higher in the transitional region than that of the steady flow under the same average Reynold number.Being the same trend with relative flow rate fluctuation,larger increment of frictional resistance was observed under higher rolling frequency and amplitude.Two main reasons were found and analyzed for the enhancement of heat transfer.They are cross region phenomenon,variation of Nusselt number with Reynolds number in transition region and effects of acceleration and outlet temperature on critical Reynolds number.
引文
[1]幸奠川,阎昌琪,曹夏昕,等.摇摆条件下单相水强制循环换热特性实验研究[J].原子能科学技术,20ll(6):672-676.
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[3]刘晓钟,黄彦平,马建,等.摇摆条件下矩形窄缝通道单相等温流动摩擦换热特性研究[J].核动力工程,2012(S1):54-58.
[4]Sichao Tan,Zhanwei Wang,Chang Wang,et al.Flow Fluctuations and Flow Friction Characteristics of Vertical Narrow Rectangular Channel Under Rolling Motion Conditions[J].Experimental Thermal and Fluid Science,2013,50:69-78.
[5]Chang Wang,Xiaohui Li,Hao Wang,et al.Experimental Study on Friction and Heat Transfer Characteristics Of pulsating Flow in Rectangular Channel Under Rolling Motion[J].Progress in Nuclear Energy,2014,71:73-81.
[6]Hongsheng Yuan,Sichao Tan,Nailiang Zhuang,Linghong Tang,Theoretical analysis of wall thermal inertial effects on heat transfer of pulsating laminar flow in a channel,International Communications in Heat and Mass Transfer,2014,53:14-17.
[7]张川,谭思超,赵佳宁,等.窄矩形通道内脉动流过渡特性实验研究[J].原子能科学技术,2013(9):1539-1543.
[8]Wang Chang,Gao Pu-zhen,Wang Zhan-wei,et al.Experimental Study of Transition From Laminar to Turbulent Flow in Vertical Narrow Channel[J].Annals of Nuclear Energy,2012,47:85-90.
[2]王畅,高璞珍,谭思超,等.摇摆条件下强迫循环流量脉动特性分析[J].核动力工程,2012(3):56-60.
[3]刘晓钟,黄彦平,马建,等.摇摆条件下矩形窄缝通道单相等温流动摩擦换热特性研究[J].核动力工程,2012(S1):54-58.
[4]Sichao Tan,Zhanwei Wang,Chang Wang,et al.Flow Fluctuations and Flow Friction Characteristics of Vertical Narrow Rectangular Channel Under Rolling Motion Conditions[J].Experimental Thermal and Fluid Science,2013,50:69-78.
[5]Chang Wang,Xiaohui Li,Hao Wang,et al.Experimental Study on Friction and Heat Transfer Characteristics Of pulsating Flow in Rectangular Channel Under Rolling Motion[J].Progress in Nuclear Energy,2014,71:73-81.
[6]Hongsheng Yuan,Sichao Tan,Nailiang Zhuang,Linghong Tang,Theoretical analysis of wall thermal inertial effects on heat transfer of pulsating laminar flow in a channel,International Communications in Heat and Mass Transfer,2014,53:14-17.
[7]张川,谭思超,赵佳宁,等.窄矩形通道内脉动流过渡特性实验研究[J].原子能科学技术,2013(9):1539-1543.
[8]Wang Chang,Gao Pu-zhen,Wang Zhan-wei,et al.Experimental Study of Transition From Laminar to Turbulent Flow in Vertical Narrow Channel[J].Annals of Nuclear Energy,2012,47:85-90.