High pressure fast‐flow technique for gas phase kinetics studies
High pressure fast‐flow technique for gas phase kinetics studies
复制标题
用于气相动力学研究的高压快流技术
DOI：
10.1002/kin.550250706
复制
发表时间：
1993
影响因子：
1.5
通讯作者：
M. Molina
中科院分区：
文献类型：
--
作者：
J. Seeley;J. Jayne;M. Molina
一种适合于在大压力范围内测量基本速率常数的快流技术已经被开发出来。与传统低压技术的层流特性不同，该方法在湍流条件下运行。为了研究层流和湍流的化学动力学目的，在流管反应器中进行了流动可视化、速度剖面测量和示踪脉冲研究。此外，还确定了反应物的壁面碰撞频率：与传统低压层流技术的频率特性相比，在较高压力下，它大大降低了。此外，为了测试和验证该技术，在3-300 torr的总压力范围内测量了H+Cl2和H+O3反应的双分子速率常数；在压力低于5 torr时，以及湍流状态下高于50 torr时，与推荐的文献值的一致性非常好。©1993 John Wiley & Sons, Inc
A fast-flow technique suitable for measuring elementary rate constants over a wide range of pressures has been developed. The method operates under turbulent flow conditions, in contrast to laminar flow which characterizes the conventional low pressure technique. Flow visualization, velocity profile measurements, and tracer pulse studies have been carried out in a flow tube reactor to investigate the dynamics of both laminar and turbulent flow for chemical kinetics purposes. Furthermore, the wall collision frequency for the reactants has been determined: at the higher pressures it is greatly reduced in comparison with the frequency characteristic of the conventional low pressure laminar flow technique. Also, to test and validate the technique the bimolecular rate constants for the reactions H+Cl2 and H+O3 have been measured at total pressures in the 3–300 torr range; at pressures below 5 torr, as well as above 50 torr in the turbulent flow regime the agreement with the recommended literature values is excellent. © 1993 John Wiley & Sons, Inc.