And the type of pump.The potential performance is greatly affected by:...
Thinning by shear would suggest to me, and remember I am by no means any authority on pumps, that cavitation is taking place no? The only other way it could be thinned by shear would be due to heat caused by friction-again a guess??No I mean thinning down by mechanical shear. Nothing is added (like water). If you were to compare the viscosity before pumping and after pumping it would have to be at the same temperature to make a true comparison.
All pumps have trouble lifting the liquid (head). This is the vacuum side and with a high viscous material you don't want to lift it you want a positive pressure on the vacuum side. You achieve that by placing the pump at the bottom of a vessel with a very large opening to the suction side. In some cases you place it in the bottom of the vessel like a sump pump. cavitation occurs when the pump moves faster than the material can fill the vacuum chamber. This is easily solved by choosing a bigger pump and slowing it down. Although it may not be so easy to pay for it because the bigger pump will cost more. A gear pump has a very small vacuum chamber so it is a poor choice for a high viscous material. Although a gear pump is not considered a high shear pump in comparison to a sign pump the shear is quite large.it was explained to me that the problem with pumping high viscosity liquids, as you suggest, is getting the liquid to the push side BUT I was also told that a gear pump, in a high viscosity application, will have trouble lifting the liquid (head???).
I am saying that is what happens with other hi viscosity water based materials. Whether it happens with honey (I suspect it does) I have no proof. If someone wants to check to see if the breakdown would be significant it can easily be proven. Take some raw honey and run it through the gear pump. Fill one jar with pumped honey and one with raw honey. Drop a ball of the same diameter in each jar at the same time and see if the pumped honey reaches the bottom first. To make a fare comparison you should probably let both jars stand for an hour to make sure that they are both at the same temperature.Are you saying that the gear pump WILL cause thinning of honey by the shearing action?
It will very greatly with moisture content and temperature and also the floral content. Any gear pump will create shear in the fluid. Shear will breakdown viscosity of a thick fluid. Ultra filtered honey is bound to be thinner then its raw honey state.BTT
I found that honey viscosity is 10,000 cps