気中でのイオン輸送・反応モデルと室内濃度分布予測法の開発 : 第2報-基礎実験を対象としたモデルパラメータ推定と3次元空間への適用 [in Japanese] Numerical Prediction of Concentration Distribution of Negative Ions in Indoor Environment : Part 2 Estimation of Reaction Probability Using Duct Chamber and Application to 3D Room sized Space [in Japanese]
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本報を含む一連の研究は,気中に放出されたイオンの移流・拡散性状、固体面に対する沈着現象,正負イオンの再結合現象ならびに気中での化学反応現象等の物理化学現象に着目し,その工学的モデリングと支配パラメータの推定を目的とする.前報(第1報)では気中に放出されたイオンに起因する電界形成を考慮した数値モデルの概要と2次元濃度分布解析へ適用した結果を報告した.本報では第1報にて報告した気中のイオン輸送モデル中のモデルパラメータであるReaction Probability γ[-]推定の為に実施したダクト模型実験の結果ならびにバイオセーフティーレベル3の実験室で実施したセラチア菌と負イオンの濃度減衰試験結果を対象としたイオンの結合反応を含む3次元解析結果を報告する.
In recent years, the sterilization and physiological effectiveness of charged particles in indoor environment have attracted much attention, and various households electrical appliances with built-in ion generators have been released. However, the physiological influence of negative charged ions in indoor air environment is not precisely understood, and many aspects concerning the convection, diffusion properties and residence time of negative charged particles emitted into indoor air remain unknown. In particular, there are almost no case studies of methods for predicting concentration levels and its distributions by developing detailed transport phenomenon models for charged particles to analyze the behavior of these in indoor environments or architectural fields. Toward this end, the overarching goal of this work is to develop the numerical method that reproduces the transportation of negative/positive charged ions in indoor air. The numerical models are based on fundamental physicochemical and electrical principles. To be more precise, electrophoretic migration model, wall surface deposition model based on molecular diffusion and electrophoretic migration, and uni-molecular and bi-molecular reaction model of negative and positive charged particles were proposed. The coupled analysis of CFD and proposed numerical transportation models of charged particles were carried out to aim at 3-dimensional cylinder type duct model. This paper reports two topics. The first is the outline of negativee charged ions concentration decay experiment in the cylinder type test chamber and estimation results of reaction probability a depositing to different surface materials. The reaction probability of cluster ions depositing to electrically conductive surface was assumed to an order of 10^<-4>[-]. The second topic is numerical prediction corresponding to the experimental setup and the results of numerical simulation for transport phenomena of negative charged particles were in reasonable agreement with the experimental results.
- Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan
Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 34(151), 11-21, 2009
The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan