I have found the concept of NPSHa quite interesting and have been thinking through the classical definition. Will someone tell me if it is possible or likely that a NPSHa analysis could result in a negative quantity for NPSHa? I could refer to this concept as NNSHa (Net Negative Suction head available). If if fact this can physically occur, would this new term more corretly be referred to as Net Negative Suction head unavailable or Net Postive Suction head unavailable.
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