Selecting a Lobe Pump, Impeller and Heat Exchanger for Highly Viscous Liquids

<...impeller which is going to be used for complete dispersability& mixing...>

It may be that static mixers are more appropriate to this application. Pilot plant trials would be valuable here.

<...lobe pump used to transfer this hig viscous product to heat exchangers...>

Please give some indication of flowrate. Gear pumps are also applicable.

<...scrape type heat exchangers which are used to cool the product as product should be scraped from surface...>

Look at milk processing equipment, in particular. Scraped-surface heat exchangers come in all shapes and sizes. Some idea of flowrate would be needed as a next step.

Thanks for your prompt reply but would static mixer be the best option for shear & mixing. how would if we use marine impeller or six blade turbine.

for lobe pump& heat exchanger, i am also calculating flow rate after that i would be able to discuss.

wud be thankful if u wud suggest about agitator first

Marine impellers are usually designed for revolution speeds which are different from those used for stirring fluidic material in vessels. So if you use a standard marine impeller you might end up with a vessel-stirrer combination that will not work.

You should also note that "sauce" usually is a non-newtonian fluid. That means that the visosity may change depending on the shear load that is applied to the liquid by the rotating impeller. If you know these properties you will be able to define a rotational speed limit which will needed to select a suitable impeller size and geometry.

To design / select the right mixer (or impeller) you also need to know size and geometry data of the vessel, the viskosity properties of the liquid or liquids to be mixed and required throughput rates. Will it be a batch process?

As one of the contributors said before: I would rather suggest to use a static mixer or a mixing pump. But it is difficult to give you a more precise answer without knowing more about your process.

Regards nudnik

for lobe pump selection, please tell if flow rate is 500 lph & if we have to pump fluid upto 6m of two vertical sections with 30 mtr piping, how could we calculate the pressure drop for pump.

i think gear pumps are not advisable for food products

you can use 4" size 500 rpm blade type mixture and you can use lobe pump at 250/300 rpm , but you have not mentioned pressure or head required for lobe pump .

for more details you can send me mail at malharpump@gmail.com