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Experimental analysis of natural convection in open joint ventilated facades with 2D PIV

机译：二维PIV的开放式通风立面自然对流的实验分析。

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摘要

The main particularity of Open Joint Ventilated Facades (OJVF) is that they have an exterior opaque coating separated from the mass wall by a ventilated air cavity. The exterior coating material is arranged in slabs separated by open joints that enable exterior air to enter and leave the cavity all along the wall. Under radiation conditions (and negligible wind velocity) the natural thermal convection produces a chimney effect that forces external air to circulate along the air cavity at an unknown rate. As a consequence of this mass exchange through the openings, the heat transfer problem turns more complex: air motion and thermal field are strongly coupled and therefore highly dependent on geometric characteristics of the wall. This article reports the application of Particle Image Velocimetry technique (PIV) to measure the velocity field inside the air cavity of an OJVF model in laboratory conditions. Measurements were performed for the vertical central plane of the cavity, for three different heating conditions corresponding to Ra = 5.92 x 10~8, Ra = 9.19 x 10~8 and Ra = 1.35 x 10~9, based in the channel height, and with a Re about 104. Detailed information of the flow behaviour inside the air cavity are presented and discussed. Special attention is paid to the ventilation effect through the joints.
机译：开放式联合通风幕墙（OJVF）的主要特点是，它们具有外部不透明涂层，并通过通风腔与质量壁隔开。外部涂料布置在由开放式接头隔开的平板中，这些接头可使外部空气沿整个壁进入和离开空腔。在辐射条件下（风速可忽略不计），自然对流会产生烟囱效应，迫使外部空气以未知的速率沿气腔循环。通过开口进行质量交换的结果是，传热问题变得更加复杂：空气运动和热场紧密耦合，因此高度依赖于壁的几何特性。本文报道了粒子图像测速技术（PIV）在实验室条件下测量OJVF模型气腔内部速度场的应用。根据通道高度，对腔的垂直中心平面进行了测量，测量了三种不同的加热条件，分别对应于Ra = 5.92 x 10〜8，Ra = 9.19 x 10〜8和Ra = 1.35 x 10〜9，并且Re约为104。介绍并讨论了气腔内部流动特性的详细信息。要特别注意通过关节的通风效果。

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