Air Flow Management in Raised Floor Data Centers by Vaibhav K. Arghode & Yogendra Joshi

Author:Vaibhav K. Arghode & Yogendra Joshi
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

3.1.4 Effect of Tile Pore Size

The characteristics of two pore sizes of 6.35 mm (1/4″) and 3.18 mm (1/8″) are shown in Fig. 3.2a, c. For the smaller pore size 3.18 mm (1/8″), air is not observed leaving the measurement plane from the aisle side, as seen with larger pore size 6.35 mm (1/4″). This resulted in air entrainment from the aisle, as compared to air exiting from the aisle side, as observed from stream traces. With smaller pore size, the number of pores is larger, and pore to pore center spacing is smaller, resulting in a greater number of closely spaced jets. Smaller pore size will also result in faster decay of the jets, as the jet decay length varies linearly with pore diameter (Arghode and Joshi 2013), thus reducing the region of influence of entrainment and flow development above the tile surface. This may be the reason for differences in flow profiles near the aisle for the two cases. Minimal influence on pressure loss factor (Keff) for the two pore sizes was observed.

It is possible that the influence of pore size on flow at the top may not be evident from these measurements, as the two pore sizes are very small as compared to tile size. CFD investigation presented in the Sect. 3.2 provides more insight on this aspect.

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