why spray has no vapor near nozzel using sprayFoam？

acaist · February 24, 2020, 15:45

Hello! I found the spray vapor is absent near nozzle (red circle region) when I test sprayFoam solver in tutorial acchemBomb. Is it a physical result? Maybe the evaporation is too slow there (red circle) but I don't know how to fix it. Any help or advice will be appreciated.

acaist · February 24, 2020, 22:28

Time is 0.00045s after injection, and the parcel image is attached. It is strange that parcel exists while vapor is absent. Maybe the reason is that liquid spray does not break up there, so there is no vapor?

raumpolizei · February 25, 2020, 14:31

Hello acaist,
my first suggestion is to check the parcel temperature at injection. Before they start to evaporize, the parcels need to heat up and it could be that at the temperature you are injecting, the vapor pressure is so low that vapor release is almost unperceivable. Could you color the parcels with their temperature?
RP

acaist · February 7, 2022, 05:03

2 years later, I remember my account. Thanks your suggestion, it works. By change the fuel injected temperature from 373 K to 573 K, the problem solved.

acaist · February 7, 2022, 05:06

Quote:

Originally Posted by raumpolizei

Hello acaist,
my first suggestion is to check the parcel temperature at injection. Before they start to evaporize, the parcels need to heat up and it could be that at the temperature you are injecting, the vapor pressure is so low that vapor release is almost unperceivable. Could you color the parcels with their temperature?
RP

Thanks, raumpolizei.
2 years later, I finally remember my account. Thanks your suggestion, it works. By change the fuel injected temperature from 373 K to 573 K, the problem solved.

February 25, 2020, 14:31		#3
raumpolizei Member Join Date: Dec 2018 Location: Darmstadt, Germany Posts: 87 Rep Power: 7	Hello acaist, my first suggestion is to check the parcel temperature at injection. Before they start to evaporize, the parcels need to heat up and it could be that at the temperature you are injecting, the vapor pressure is so low that vapor release is almost unperceivable. Could you color the parcels with their temperature? RP acaist likes this.

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February 7, 2022, 05:03		#4
acaist New Member Junqian CAI Join Date: Jul 2016 Location: Tianjin,China Posts: 9 Rep Power: 9	2 years later, I remember my account. Thanks your suggestion, it works. By change the fuel injected temperature from 373 K to 573 K, the problem solved.