How should the Venturi be selected to achieve a vacuum of -96 KPA?
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I hope to use a venturi to create a vacuum (with an absolute pressure of 3-4 KPA; the corresponding vacuum level should be around -96 to -97 KPA, right?) ） ； The working medium is clean water at a temperature of around 25°C; the pipe diameter is 4-inch pipe (25 mm in diameter) ； A water ring pump is used to drive clean water to flow through a venturi to create a vacuum. To achieve this level of vacuum, what flow rate and head should the pump have? What type of venturi should be chosen or how should a venturi be designed?
I forgot to mention it – the main goal now is to create a vacuum of around -96 kPa using plain water at normal pressure and temperature. How can this be achieved in the cheapest and most practical way? The diameter of the water pipe does not have to be fixed at 25mm.
-Can room temperature water at 25 degrees create a vacuum of 3~4 kPa? ? It’s impossible to achieve at least 3 kPa; the saturated vapor pressure of water at 25 degrees is already 3.1 KPa! It’s also impossible to operate at 4 kPa, as the pumping capacity is far too low!
Thank you all for your replies. My requirement is as follows: Initially, I plan to use a venturi to create a vacuum. The working medium in the venturi is water at room temperature (25°C), and a pump is used to circulate clean water in order to create a vacuum at the venturi throat. The medium drawn in is wastewater; I want the wastewater to boil and evaporate at around 25°C, with the steam being drawn away by a Venturi effect and then condensed by water. Excess water overflows from the circulation tank. So what concerns me the most is whether a vacuum level of around -96 KPA (or an absolute pressure of 3-4 kPa) can be achieved, and whether it can be maintained stably And what flow rate and head of pump, along with what model of venturi tube, are required to achieve this. I welcome everyone's advice!
It is water at room temperature (around 25°C)； 3-4 KPA is absolute pressure; the corresponding vacuum level should be around -96-97 kPa. Do you have any suggestions or plans?
I explained my design intentions again downstairs; could you please take a look and see if there is any possible solution? Thank you!
Your idea of using water to create a vacuum at -96~97 degrees cannot be implemented. It can be done as follows: 1) Use water at 25 degrees to achieve a vacuum of over 7 kPa! 2) A steam ejector (also a Venturi) + condenser + liquid ring pump configuration can effectively achieve a vacuum of 3 kPa.
The working medium is clean water at a temperature of around 25°C; the pipe diameter is 4-inch pipe (25 mm in diameter)； A water ring pump is used to drive clean water to flow through a venturi to create a vacuum.
Boss: How can we implement the plan you mentioned? How to select the various components? Could you please give some advice?
Thank you very much for your suggestion. I’m not sure whether the 3 kPa you mentioned refers to absolute pressure or vacuum pressure. If it’s absolute pressure, it’s exactly the solution I need. Do you have any similar experiences that could serve as a reference? Thank you for the reply
I’m speechless at you – a smart pervert who’s ignorant yet full of arrogance