0 0 votes Consider fully developed flow in a circular pipe with negligible entrance length effects. Assuming the mass flow rate, density and friction factor to be constant, if the length of the pipe is doubled and the diameter is halved, the head loss due to friction will increase by a factor of $4$ $16$ $32$ $64$ Fluid Mechanics gateme-2015-set1 fluid-mechanics-and-thermal-science fluid-mechanics flow-through-pipes + – ♦Arjun 189 views answer comment Share Follow Add Sync Questions 0 reply Please log in or register to add a comment.