Wind tunnel experiment on area-averaged transfer coefficient of non-uniform block with a salinity change method

点击翻译按钮获取中文摘要

We investigated bulk scalar coefficient of the street in the three-dimensional canopy with various conditions of arrangement, plan area density, frontal area index, and variability of model height in a wind tunnel using salinity method. The results can be summarized as follows.(1) The relationships between bulk scalar coefficient and frontal area index of both staggered and normal arrayed canopy with uniform height shows different tendency. The bulk scalar coefficient of three-dimensional canopy of staggered and normal pattern have similar value under the sparse and dense conditions, in contrast, bulk scalar coefficient of staggered canopy is higher than that of normal canopy under the condition of frontal area index = 27.4%.(2) The bulk scalar coefficient of uniform canopy is larger than that of canopy with height variation under the condition of plan area density < 17.4%. In Contrast, bulk scalar coefficient of uniform canopy is smaller than that of canopy with height variation under the condition of plan area density = 30.9%. Such a tendency is opposite to the result of drag force coefficient.