The open channel flow has a free or rather open surface whereas the pipe flow has a closed surface.
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open cahannel flow and pipe flow Open channel is always at atmospheric pressure Pipe flow has pressure either above or below atm
Flow process takes place in open system & non-flow process takes place in closed system.
This is copied from Section 6.11, Question 8 in "Modern Refrigeration and Air Conditioning." The answer is (B), "The open circuit prevents flow. The open AEV allows flow to occur." Although a bit obscure, the answer is correct because, within the context of an electrical circuit, an "open circuit" (i.e. disconnected wire) would prevent the flow of electrical current. Within the context of a refrigeration circuit, an open AEV (automatic expansion valve) would permit the flow of refrigerant into an evaporator coil to provide cooling.
If the switch is open, current does not flow.
Of course it has a break . open circuit means infinite resistance , so no electrical charge can flow through it .