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Abstract In this study, a numerical investigation of fluid flow and heat transfer of Al O water nanofluids in a pillow plate heat exchanger with a two-phase model is investigated. The flow regime studied in this study is in the laminar flow regime such that the Reynolds numbers are 250, 500, 750, and 1000 and the volume fraction of the nanoparticles remained so that the fluid stayed in Newtonian. The volume fraction of nanoparticles is (Formula presented.) 0, 1, 2, and 3 %. In this study, the effect of the shape of the welding points used in the pillow plate has also been investigated in such a way that three modes of circular welding point, large-diameter elliptic welding point along with the flow and large-diameter elliptic welding point perpendicular to the stream have been investigated. Numerical simulation results show that using nanofluid and increasing Reynolds number improves heat transfer, as well as circular welding point, shows the best heat transfer rate. The shape ....
A deluge of rain where we re seeing the flash flooding. be careful. we re seeing a lot of lightning and tornado warnings. this is what we re focussing on, too. a big, big concern for us storm surge. you want to be careful here. you want to stay indoors and we ll continue to track this for you, chris. thank you so much for that. i know that you re going to be following this throughout, michelle. let s go back to ali. ali, as she s talking about people staying out of the path of the storm, we have been hearing from the mayor of charleston saying over and over and over again over the last couple days, hunker down. stay inside. i m looking at you almost getting blown away and you can see why. what are you seeing around where you are not just in terms of the weather but have people been out and about at all today? well, as of noon yesterday pretty much all the shops closed down here. there was an evacuation order. they had done counterflow on the highways. they wanted to get people ou ....
Thank you so much for that. let s go to katie beck in savannah, georgia, where the governor issued a mandatory evacuation order. katie, what s the latest in savannah? reporter: well, we re just starting to see some landfall here as well, chris, and people are heeding those evacuation orders. you can see behind me this area is deserted. we are in historic downtown savannah right along the river. this is a very popular tourist area. lots of bars. lots of restaurants. right now every hotel is closed. every shop is closed. there are sandbags in front of the doors. so obviously people know to take those orders seriously and get out ahead of this storm, not wait until it arrives. tomorrow morning traffic on 95 out of savannah will be counterflow, that means the traffic will be going away from here. they ll be telling people to continue to evacuate to try to avoid some of the traffic backups we ve seen in the past. additionally the civic center here in savannah will be opening its doors to ....
We re going to watch this area of low pressure drop south and east. take the snow and bring the wind with it. but what happens here, which we ve seen, this area of low pressure drops south and east but what happens, this area of low pressure transfers this energy to a developing area and a coastal low. so it becomes kind of a different animal, so to speak. warm air, because of this counterflow around this low, brings the warm air in. around the coast we could see some rain. then what happens with this low, does it move north or does it move east? it looks as though we re going to see snow potentially 5 to 10. could this snow move north of that? what happens if this low moves east, then it stays a washington, d.c./baltimore affair. if it moves further north, it could po pen chul lpotentially bring the snow further north. that s what looks like will happen, wolf. we ll see it in the midwest. ....