Open Channel Experiments on the Liquid Film Coefficient

该奖项旨在支持研究，以提高对空气-水传质的理解。液膜系数与低溶解度和相对不活泼的化合物有关，其中空气-水转移由水相或两相控制，如O2， N2, CO2， DDT，大多数PCB和几种汞化合物。该系数描述了在液相中传递的阻力。设计并建造了一种独特的水槽，用于在实验室水槽的规模上研究水相控制的传质，同时保持容器或实验室烧杯的测量精度。本研究最根本的目的是确定流动的明渠与自由水面相互作用以降低液膜系数的基本机制。研究结果有望为评价现有的自然流数据提供依据，并为确定自然流液膜系数时需要测量的重要参数指明方向。首席研究员完全有资格进行拟议的研究。建议提供为期两年的持续奖助金。该奖项第一年为75,827美元。

This award is to support research to improve understanding of air-water mass transfer. The liquid film coefficient relates to low solubility and relatively unreactive compounds where air-water transfer is controlled by the water phase or by both phases, such as O2, N2, CO2, DDT, most PCB's, and several mercury compounds. The coefficient describes the resistance to transfer in the liquid phase. A unique flume has been designed and built to study water-phase controlled mass transfer on the scale of a laboratory flume, while maintaining the measurement accuracy of a contained tank or laboratory beaker. The most fundamental objective of this research is to determine the basic mechanism by which a flowing open channel interacts with the free water surface to reduce the liquid film coefficient. The results are expected to provide a basis for the evaluation of existing natural stream data and to specify the important parameters to be measured when determining the liquid film coefficient in natural streams. The principal investigator is highly qualified to carryout the proposed research. A two year continuing grant is recommended. This award is for $75,827 for the first year.