By Payne C.H.
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Additional resources for A Synopsis of the Ionization Potentials of the Elements
Thus the critical velocity required is that which is only just sufficient to project the liquid to the height h of the sessile drop. This height is simply that derived from conservation of energy, mV2/2= mgh, giving h = V2/2g. 3). 3. When falling from greater heights the surface of the liquid will be in danger of being entrained in the bulk liquid. 1. 5 ms-’. ern, critical and high velocities. 33 Entrainment of the fact that the velocity is a function of the rutio of surface tension and density, and, in general, both these physical constants change in the same direction from one liquid to another.
1). The entrainment process is a folding action that necessarily folds over the film dry side to dry side. T h e submerged surface films are therefore necessarily always double. Also, of course, because of the negligible bonding across the dry opposed interfaces, the defect now necessarily resembles and acts as a crack. Turbulent pouring of liquid metals can therefore quickly fjll the liquid with cracks. The cracks have a relatively long life, and can survive long enough to be frozen into the casting.
The perfect atomic contact may again exist where the liquid covers the substrate, but at its edges the liquid will form a large contact angle with the substrate, indicating, in effect, that it does not wish to be in contact. Technically, the creation of the liquidkolid interface raises the total energy of the system. ) The problem with the surface film only occurs when it becomes entrained and thus submerged in the bulk liquid. e. it will be in perfect atomic contact with the liquid. As such it will adhere well, and be an unfavourable nucleation site for volume defects w c h as cracks, gas bubbles or shrinkage cavities.
A Synopsis of the Ionization Potentials of the Elements by Payne C.H.