Recent content by cjc0117

I tried posting this question in this forum a couple of weeks ago, but didn't get an answer to my question. I'm going to try posting it again using the formatting template so that it is hopefully clearer. I am also not sure if this is the right forum to be posting this in. It is a problem I ran...

Thanks for the reply, and for the compliment! It was certainly painful to type all of it out...Also, no, there are ##N## streams and ##N## separate containers with which to collect liquid from each stream. So for each stream ##i##, the mass of liquid, ##m_{i}##, is calculated by subtracting the...

Just want to rewrite all my work using LaTeX and clarify a few things... Objective: Show that if \sum^n_{i=1}\dot{m}_i=\frac{\sum^n_{i=1}m_{i}}{t} then \delta{\left(\sum^n_{i=1}\dot{m}_{i}\right)}=\delta{\left(\frac{\sum^n_{i=1}m_{i}}{t}\right)} Define: M_{1,i}\ \mbox{and}\ M_{2,i}\ \mbox{are...

I have calculated the mass, ##m_{i}##, of liquid exiting the outlet of stream ##i## for ##n## number of streams over a measured time period of ##t##, by measuring the mass of liquid + container, ##M_{1,i}##, and subtracting from that the measurement for the mass of the container, ##M_{2,i}##...

Hi, I am trying to find the error propagated by calculating the sum of a set of mass flow rates collected over the same length of time. The sum of mass flow rates can be calculated with two approaches, since the collection time is the same for all of them. Approach (1) is adding up all of the...

Thanks for the replies. I had found the two s values to be s_{1}=3 and s_{2}=0. s_{1}-s_{2} is equal to a positive integer. I thought in this case, there are two independent solutions: y_{1}=\sum^{∞}_{m=0}a_{m}x^{m+s_{1}}(Eqn. 1) y_{2}=ky_{1}ln(x)+\sum^{∞}_{m=0}b_{m}x^{m+s_{2}} (Eqn. 2) I...

Homework Statement Solve x(1-x)\frac{d^{2}y}{dx^{2}}-2\frac{dy}{dx}+2y=0 using the Frobenius Method. Homework Equations R(x)\frac{d^{2}y}{dx^{2}}+\frac{1}{x}P(x)\frac{dy}{dx}+\frac{1}{x^{2}}V(x)y=0 R_{0}s(s-1)+P_{0}s+V_{0}=0 y=\sum^{∞}_{m=0}a_{m}x^{m+s}...

I'm trying to find a comprehensive list of the empirical coefficients to be used in the following equation for calculating ideal gas constant pressure heat capacities: \frac{c^{IG}_P}{R}=A+BT+CT^{2}+DT^{-2}+ET^{3}(Eqn. 1) cPIG is the ideal gas constant pressure specific heat capacity; R is...

Okay, I figured it out. Thank you gneill!

I'm not sure if this is the right forum to ask this question, but it arose as part of an engineering problem, so here goes. The Peng-Robinson EOS is as follows: P=\frac{RT}{v-b}-\frac{a[1+k(1-\sqrt{\frac{T}{T_{c}}}]^{2}}{v(v+b)+b(v-b)} I'm just wondering if this equation can be solved...

Thanks for the reply David. You're right; my post wasn't really structured well. Just a mess of questions. Anyways, I originally asked these questions because I was trying to solve a bigger problem that required me to get two-phase properties for a single component system. I was hoping against...

I am having some trouble fully understanding the basics and I just wanted to see if somebody would please clarify this for me. First, say you have a one component system in two phases: vapor and liquid. Gibbs' phase rule restricts the system to one independent, intensive variable that may be...

Perfect, that's exactly what I did wrong. I left the Tsat in the denominator in °C because the Antoine coefficients are for temperatures in °C, but I converted the other Tsat to Kelvin and now I'm getting 136.6 BTU/lb. Thanks a lot. It didn't make sense to me at first that I should convert to...

Hi everyone. I am having a problem that hopefully someone here can help me with. For the purposes of flash calculations, I’m trying to find the enthalpy of vaporization of a compound using the Antoine equation and Clapeyron equation. I am using heptane at 15.5597 psia as an example. For the...

That's a nice and simple way to do it, SammyS. Very clever.