Intern Experiments - 3

hii frnz... moving ahead.. we have done a lot of experiments by now ... the problem if properly understood says that the product shows unusually high pull force if the RC/Fc door is opened before the next opening .....hence the culprit id the opening of the door.
we have started with understanding the flow of air inside the refrigerator when the door is opened... for this we tried to make model of a ref whose side walls were made of perspex walls and witht the help of a smoke machine tried to see the flow.. .. unfortunately the flow was too turbulent in FC and the flow was thus not visible properly... although we got some hints as too what can be the most influential causes behind the phenomena.. they can be the turning offf of the fan and the slamming of the door...
our next set of experiments are based on difffernetiating there effects on the pressure falll..
there has been a lot of previous work on this.. and this problem is faced by all leading refrigerator makers.....a vacuum valve is the latest addition by companies....