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Top .1524 .1523 .1517 .1542 .1450 Bottom .1520 .1514 .1495 .1482 .1475 Plate 2^ .1705 .1626 .1540 .1540 .1481 N C W .1612 .1573 .1609 .1550 .1564 .1538 .1647 .1537 .1460 .1483 Plate 2^ .1714 .1608 .1564 .1551 .1423 Figure 32-5. Weight of 1/2" Zinc Disk (grains) for a 6" Electrode DISCUSSION Electrolyte-Static Head Effect In the operation of the zinc-chlorine cell, electrolyte flowing through the porous- graphite chlorine electrode is recirculated at a constant rate with the use of an electrolyte pump. Thus, electrolyte injected into the cavity of the porous-graphite chlorine electrode is forced to flow through the porous matrix due to the line pressure developed by the electrolyte pump. Flowing through a porous matrix is analogous to flowing through an orifice in which a pressure drop develops due to the flow resistance along the pore. The uniform resistance of the pores enables elec trolyte to flow uniformly through the entire electrode. The uniformity of the flow distribution through the chlorine electrode is primarily controlled by the character istics of the pores and, from this point of view, static head should not affect cell performance by influencing flow distribution uniformity. However, the static head height can affect the flow pattern at the top of the elec trodes. Under the present stack design, the up-flowing electrolyte, accumulated as a semi-quiescent liquid, changes direction and flows horizontally towards the drain cup leading to the sump. If the static head is too small, i.e. under-size, a signi ficant amount of turbulence could develop at the top of the electrodes causing 32-11PDF Image | Development of the Zinc-Chlorine Battery for Utility
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