论物质的分子结构与液体导热率理论方程

分析了在国际化学化工学术界有影响的Ｂｒｉｄｇｍ ａｎ 理论式及著名的Ｌａｔｉｎｉ经验式的不足后，以张克武气体不平衡状态理论方程导出的液体导热率理论方程和有机分子的半金属结构理论为基础，建立了用分子结构来计算液体导热率的理论方程．以液烃、醚、醛、酮和酯等２５６ 种纯质８５０ 个实验数据检验，平均误差１．８％ ，其精确度比Ｂｒｉｄｇｍ ａｎ 理论式约高１０ 倍，比Ｌａｔｉｎｉ式高５ 倍，显著优于前人公式．

有关液体导热率及三个著名计算公式的讨论和评述

文献［1］提出国际上“三个著名的液体导热率计算法”：即Latini法，沸点法（Riedel-Sato法）和张克武法．本文通过检索集了大量经过严格评审的实验数据，主要根据当前工程设计要求针对这三个方法加以对比分析、研究、证明了文献［2］（已被“SCI”收录）中提出的液体导热率理论方程计算简便，物理意义明晰，普适性好，特别是精度高，经用26类256种850个实测据验算其平均误差仅1．89％．比著名的Latini式和Riedel－Sato式的精高5倍以上。这一结论对化工、动力和高新技术的生产工艺控制和开发设计的基础计算的可靠性的保证，有很大的实用价值。

Heat transfer and friction factor of Therminol liquid phase heat transfer fluid in a ribbed tube

Experiments and simulations on flow and heat transfer behavior of Therminol-55 liquid phase heat transfer fluid have been conducted in a ribbed tube with the outer diameter and inner diameter 25.0 and 20.0 mm,pitch and rib height of 4.5 and 1.0 mm.respectively.Experimental results show that the heat transfer and thermal performance of Therminol-55 liquid phase heat transfer fluid in the ribbed tube are considerably improved compared to those of the smooth tube.The Nusselt number increase with the increase of Reynolds number.The increase in heat transfer rate of the ribbed tube has a mean value of 2.24 times.Also,the pressure drop results reveal that the average friction factor of the ribbed tube is in a range of 2.4 and 2.8 times over the smooth tube.Numerical simulations of three-dimensional flow behavior of Therminol-55 liquid phase heat transfer fluid are carried out using three different turbulence models in the ribbed tube.The numerical results show that the heat transfer of ribbed tube is improved because vortices are generated behind ribs,which produce some disruptions to fluid flow and enhance heat transfer compared with smooth tube.The numerical results prove that the ribbed tube can improve heat transfer and fluid flow performances of Therminol liquid phase heat transfer fluid.