The data have also indicated that increasing heating disk diameter decreases the heat transfer coefficient.
where hD is the average heat transfer coefficient of the disk diameter.
The effect of disk diameter and noanofluid concentration is shown in Figure 14.
Figure 14 The effect of disk diameter and nanofluid concentration on heat transfer.
Design parameters included disk diameter, disk speed and type of metering gap.
Therefore, as the heating disk diameter increases, the local heat transfer coefficient along the radial direction of the disk decreases.
Not including the ring of hypofluorescent peripapillary atrophy, the scar is one disk diameter, which is twice the initial infiltrate.
The Nusselt number, Nu D based on disk diameter is given by: N u D = h D k (13).
In this figure, the heat transfer coefficient is presented in terms of Nu D /D or (h /k) versus disk diameter D. This ratio was chosen such that Nusselt number be independent of disk diameter D. These data indicate that heat transfer coefficient decreases as heating disk diameter increases.
