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Point A of head HA is at a higher elevation than point B of head HB. The head loss between these points is HL­. The flow will take place

Point A of head HA is at a higher elevation than point B of head HB. The head loss between these points is HL­. The flow will take place Correct Answer From A to B if H<sub>A</sub> =  H<span style="position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; bottom: -0.25em;">B </span>+  H<span style="position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; bottom: -0.25em;">L</span>

Concept:

If flow is from point 1 to point 2 then:

Total head at point 1 = Total head at point 2 + loss of head between 1 and 2

If flow is from point A to point B then:

Total head at point A (HA) = Total head at point B (HB) + Loss of head between A and B (HL)

If flow is from point B to point A then:

Total head at point B (HB) = Total head at point A (HA) + Loss of head between B and A (HL)

Calculation:

Given: HA > HB

HL is head loss: HL = HA - HB

HA =  HB +  HL ⇒ flow is from point A to point B

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