便携式旋转粘度计校准恒温容器的温度响应特性研究
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摘要
对不同结构及流动参数下,一种加装螺旋隔板的便携式旋转粘度计校准恒温容器内流动与传热进行了数值模拟。考察了旋转粘度计内液体的温度响应特性。模拟采用SIMPLE算法求解压力与速度的耦合,对求解变量采用QUICK格式离散,湍流模型采用Realizable k-ε模型。模拟结果表明:当水套内螺旋导流隔板圈数增加,与加热情况相比,冷却时内杯流体温度分层现象增强,不利于满足被测粘度液温度均匀性要求;加热和冷却温差相同时,对于加装不同层数螺旋隔板的结构,加热时的温度响应基本相同为0.24℃/min,冷却时温度响应随着螺旋隔板圈数增多而降低,最多相差0.036℃/min;当循环水量一定,恒温容器温度响应随热流密度提高而加快,但仅改变循环水量,对不同结构恒温容器的温度响应影响并不明显。
The numerical simulation of the flow and heat transfer in a portable thermostatic bath with spiral baffles to rotational viscometer calibration under different flow and structure parameters is developed.The temperature response characteristics of fluid in the rotational viscometer are investigated.SIMPLE algorithm is used to solve the pressurevelocity coupled governing equations employing QUICK-type scheme for variables discretization.Realizable k-Epsilon Model is adopted for modelling turbulence.The numerical results show that when the number of spiral baffles in the water jacket increases,compared with the heating condition,Thermal stratification phenomena of fluid within the cup in cooling condition is enhanced,which is not conducive to meet the temperature uniformity requirements for viscosity liquid which to be measured.When the temperature difference between heating and cooling condition is same,for Installed different spiral baffles structure heating temperature response is basically the same as 0.24℃/min.Cooling temperature response decrease with the increasing number of spiral baffles,and the maximum difference is 0.036 ℃/min.With a fixed flow rate,temperature response of thermostatic bath increases with the increase of heat flux density.While just change flow rate,the temperature response of thermostatic bath with different structure is not obvious.
The numerical simulation of the flow and heat transfer in a portable thermostatic bath with spiral baffles to rotational viscometer calibration under different flow and structure parameters is developed.The temperature response characteristics of fluid in the rotational viscometer are investigated.SIMPLE algorithm is used to solve the pressurevelocity coupled governing equations employing QUICK-type scheme for variables discretization.Realizable k-Epsilon Model is adopted for modelling turbulence.The numerical results show that when the number of spiral baffles in the water jacket increases,compared with the heating condition,Thermal stratification phenomena of fluid within the cup in cooling condition is enhanced,which is not conducive to meet the temperature uniformity requirements for viscosity liquid which to be measured.When the temperature difference between heating and cooling condition is same,for Installed different spiral baffles structure heating temperature response is basically the same as 0.24℃/min.Cooling temperature response decrease with the increasing number of spiral baffles,and the maximum difference is 0.036 ℃/min.With a fixed flow rate,temperature response of thermostatic bath increases with the increase of heat flux density.While just change flow rate,the temperature response of thermostatic bath with different structure is not obvious.
引文
[1]陈惠钊.粘度测量(修订版)[M].北京:中国计量出版社,2003.
[2]童刚,陈丽君,冷健.旋转式粘度计综述[J].自动化博览,2007,24(1):68-70.
[3]杨斌,程杰,李国芳.浅谈旋转粘度计的使用[J].现代制造技术与装备,2014(2):52-52.
[4]GB/T 10247-2008,粘度测量方法[S].北京:中国标准出版社,2008.
[5]傅吉坤.夹套热-固耦合分析设计[J].应用能源技术,2013(6):5-7.
[6]罗小平,黄岗.夹套间缩放管传热性能研究及场协同分析[J].炼油技术与工程,2008,38(11):38-42.
[7]刘美丽,毛羽,王娟,等.气粒两相流与夹套耦合传热的数值模拟[J].化学反应工程与工艺,2011,27(2):121-126.
[8]杨振岭,方伟,叶新.太阳辐照度绝对辐射计真空中腔温响应测量[J].电子测量与仪器学报,2013,27(8):709-714.
[9]周茜,马军平.一种便携式仓储温湿度检测仪的设计[J].国外电子测量技术,2013,32(11):45-48.
[10]兰羽.具有温度补偿功能的超声波测距系统设计[J].电子测量技术,2013,36(2):85-87.
[11]REINDL D,SUN K K,KANG Y T,et al.Experimental verification of a solar hot water heating system with a spiral-jacketed storage tank[J].Journal of Mechanical Science and Technology,2008,22(11):2228-2235.
[12]BAEK S M,JIN H N,HONGH,et al.Effect of brine flow rate on the performance of a spiral-jacketed thermal storage tank used for SDHW systems:A computational fluid dynamics study[J].Applied Thermal Engineering,2011,31(14-15):2716-2725.
[13]陶文铨.数值传热学[M].2版.西安:西安交通大学出版社,2010.
[14]PATANKAR S V.Numerical heat transfer and fluid flow[M].Hemisphere,Washington D.C.,1980.
[2]童刚,陈丽君,冷健.旋转式粘度计综述[J].自动化博览,2007,24(1):68-70.
[3]杨斌,程杰,李国芳.浅谈旋转粘度计的使用[J].现代制造技术与装备,2014(2):52-52.
[4]GB/T 10247-2008,粘度测量方法[S].北京:中国标准出版社,2008.
[5]傅吉坤.夹套热-固耦合分析设计[J].应用能源技术,2013(6):5-7.
[6]罗小平,黄岗.夹套间缩放管传热性能研究及场协同分析[J].炼油技术与工程,2008,38(11):38-42.
[7]刘美丽,毛羽,王娟,等.气粒两相流与夹套耦合传热的数值模拟[J].化学反应工程与工艺,2011,27(2):121-126.
[8]杨振岭,方伟,叶新.太阳辐照度绝对辐射计真空中腔温响应测量[J].电子测量与仪器学报,2013,27(8):709-714.
[9]周茜,马军平.一种便携式仓储温湿度检测仪的设计[J].国外电子测量技术,2013,32(11):45-48.
[10]兰羽.具有温度补偿功能的超声波测距系统设计[J].电子测量技术,2013,36(2):85-87.
[11]REINDL D,SUN K K,KANG Y T,et al.Experimental verification of a solar hot water heating system with a spiral-jacketed storage tank[J].Journal of Mechanical Science and Technology,2008,22(11):2228-2235.
[12]BAEK S M,JIN H N,HONGH,et al.Effect of brine flow rate on the performance of a spiral-jacketed thermal storage tank used for SDHW systems:A computational fluid dynamics study[J].Applied Thermal Engineering,2011,31(14-15):2716-2725.
[13]陶文铨.数值传热学[M].2版.西安:西安交通大学出版社,2010.
[14]PATANKAR S V.Numerical heat transfer and fluid flow[M].Hemisphere,Washington D.C.,1980.