Nucleate Pool Boiling: Units Conversion Video Lecture | Heat Transfer - Mechanical Engineering

previous screencasts I calculated what a
heat flux and heat transfer coefficient
were for a situation that involved
nucleate pool boiling however I left it
without showing how the units worked out
so I'm going to continue that screencast
by showing you the three different parts
of the equation and show how the units
actually do match so eventually what we
want is we found what should have been a
heat flux which is in units of watts per
meter squared so if you take a look at
the first term what you'll find is you
have Newtons seconds per meter squared
times joules per kilogram kilogram meter
per second squared and one Joule is one
second and so when we do the canceling
for this particular term we end up with
units of watts per meter now let's look
at the second term so here we have
meters per second squared
kilograms per meter cubed and then on
the bottom Newton's per meter and again
a Newton is a kilogram meter per second
squared and so now if we do the
canceling we have one over meters
squared however since this term is taken
to the one-half our final units are
going to be 1 over meter and finally in
the
third time you might be able to look at
it right away and see Jules cancels
Jules kilograms cancels kilograms Kelvin
cancels Kelvin and this particular
expression is unitless so now let's take
the two terms that we do have units for
so we have watts per meter and we
multiply that by one over meters what we
want for our heat flux we have watts per
meter squared
the units do balance out on both sides
of the equation