Recent content by pigna

Ok l have posted two time the same images... sorry... as you can see confusion and no conclusions. Probably when i say that I ' m not sure if an integral goes or not to zero it actually goes because in different case I don't even use the hypothesis of irrotational flows. And as you can see I'm...

It is exactly what I'm not able to do. I have tried to do that or to rewrite the curl term as a gradient but I haven't reached any result... do you know some book or internet content that address this issue in a comprehesible way?

Hi. I'm studying fluid dynamics and in particular potential flows. I know that for an irrotational flow the velocity field is a conservative field and it can be rapresented by the gradient of a scalar field v=-∇Φ. In this case the explicit form of Φ is something like a line integral between a...

thanks for the replies... looks at the pdf in which I clarify what I'm interested in...

The definitions of the winding number, that I have found, do not consider the case in which the point lies over the curve. Is there the winding number undefined ? I'm interested in this issue because I'm writing an algorihm for polygon offsetting that as first step creates a row offset polygon (...

They are Not included because those sides are Not suppose to Loss any heat. Normaly The heat losses for a fin are espressed per unit length. If you consider a finite fin on the directIon w you got to do some aproximations to use The same relations you Will use for an infinite fin. U also have to...

When you Say fin you Mean something that is Not finite along w director. This allow You to considerazione The problem as mono dimensional.

I'm sorry the upload of the image have made its quality Dim. Now I'm using a Phone and is difficult for me to write code lines. I try to upload a pdf version of the pic. Forgive me for the unproper Way I'm posting. The quality should be better.

The biot number characteristic length is volume/(eternl surface). For convention problems the characteristic lengths are in according to the correlation u are using. Normaly They are the Most intuitive ones. I suggest you to look for the incropera textbook. U can find the pdf version easily...

I' m studing the hodge helmotz decomposition of a flow Field, and i have Found different definitions. I'm Not sure to have assigned the rigth meaning to the terms of the decomposition. Look At The picture( i don't write here cose there are several equations).

I'm studynig thermodymamics using the textbook 'Thermodynamics foundations and applications' (Beretta and Gyftopopulos). The definition of a system according to the authors consist in the specification of : -the costituents of the system ( atoms or molecules or prottons neutrons ... in...