都市表面における対流物質伝達率に関する風洞実験 : 都市域における建物外表面対流熱伝達率に関する実験的研究(その2)

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In this paper, by the measuring of evaporation rate from the filter paper pasted on building model surfaces, the convective mass transfer coefficients (k) on outside surface were examined by wind tunnel experiments. The merit of this technique is that it is easy to restrict the flux within an arbitrary surface in question. Firstly, the effects of wind direction on surface-averaged k in a cubic model were revealed by measurements in every 7.5 degrees direction from windward to leeward. The value (k) of leeward surface is about 2/3 of windward one. As for the roof surface, its variation is small less than about 6%. Secondly, in order to clarify the change of k in urban street canyons due to its aspect ratio, the k on three kinds of surfaces (windward, leeward, and roof) were compared in various kinds of 2-dimensional urban street canyon models. In the range between L/H=1 and 2.5, the value (k) of windward is decreased while that of leeward is increased. These values of windward and leeward decrease rapidly in the range of L/H<1, then converge same value in the end. On the contrary, the value (k) of roof surface is almost constant within the limit of this experiment.
社団法人日本建築学会の論文
2000-01-30