Basically I am simulating a heat exchanger in which a cold fluid is entering with the temperature of about 11degrees and hot fluid is entering with 33degrees. i have used the pressure outlet boundary condition and as you know by default backflow temperature is 300k by default. but as soon as i execute simulation i get reverse flow again and again. The reverese flow comes then dissapears again, comes and then again dissappears. it has not completely vanished after the first reverse flow. with the default settings i am more frequently getting reverse flow. mesh quality and rest of the important aspects of problem are okay i have cross checked again and again and i think the problem is due to backflow temperature. could you please give me an idea how to set backflow temperatures for both cold and hot outlets.? which typical values i should choose except 300k to avoid reverse flow.
Adel Ghenaiet no static pressure is 0. thats okay. In pressure outlet boundary condition i m talking about the thermal backflow temperature which is by default 300k
this temperature could be obtained by an estimation from flow energy equation
Adel Ghenaiet how to estimate can you please address this point with explanation?
- Badges
- Science topic