In rooms with laminar unidirectional flow from above, a stable flow is essential for proper operation. This flow is interfered by heat sources, which also emit particles. A contaminated volume forms around the heat source, endangering product and personal protection. The aim of the present work is to establish a stability limit for a cylindrical heat source in laminar unidirectional flow from above, at which the flow stability is ensured. A mathematical model is developed in order to allow the estimation of the geometric expansion of the contaminated volume. The convective heat output, the radius and the height of the heat source as well as the supply air velocity of the unidirectional flow are regarded as central influencing variables. With use of laser-optical measurement methods and numerical flow simulations, the dimension of the contaminated volume is quantified by varying the influencing variables. Based on this, a stability criterion is derived. The work provides a functional correlation between the influencing variables and the dimension of the contaminated volume. The results allow an adaptation of the supply air velocity according to the loads in the room, which leads to considerable energy savings in the operation of the clean room system.
|Advisor:||Kriegel, Klaus, Fitzner, Martin|
|School:||Technische Universitaet Berlin (Germany)|
|Source:||DAI-C 81/3(E), Dissertation Abstracts International|
|Keywords:||Contaminated volume, Laminar unidirectional flow, Cleanrooms, Contamination control|
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