Paper Conference

Proceedings of ASim Conference 2012: 1st Asia conference of IBPSA-China, Japan, Korea


A study on the similarity between scalar and momentum roughness lengths based on the scalar concentration measurement

Nik Ibrahim Izual, Naoki Ikegaya, Aya Hagishima, Jun Tanimoto, Juyeon Chung

Abstract: The understanding on how urban roughness affects the transport mechanisms of momentum, heat and scalar between urban surfaces and atmosphere is an important issue to be investigated from both the viewpoints of urban climatology as well as building physics. This is to account for accurate estimation of thermal behaviour of an urban area consisting of buildings. Under these circumstances, this study reported the result of wind tunnel experiment on both transfer coefficients and profiles of absolute humidity over block arrays with sufficient scalar source size. In addition, the roughness length for scalar included in logarithmic equation for scalar concentration was estimated based on its measurement. The result suggested the possibility that the universal relationship of roughness length for momentum and scalar expressed by roughness Reynolds number for both a smooth wall and scaled block arrays exists.
Pages: 370 - 377