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# two phase mixture density equation

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 knapee (Petroleum) 14 Apr 11 10:04
 Dear Professional I would like to bother you a triaval how to derive the two phase density formula.I try to derive from this formla Two phase density = (weigh of liquid + weight of vapor)/[weight of liquid/liquid density + weight of vapor/vapor density]to another formula as followingtwo phase density = [100/(100-%flash)]/Liquid density + %flash/vapor densityBut I can't get this resultCan anyone give me an kindly help?Thank you for any help.
 Enkelaar (Chemical) 15 Apr 11 2:39
 Hope the following can help you a bit:You require the hold up for both gas and liquid phase:Hl = liquid hold upHg = 1- Hl - Gas hold uplabda l = Ql / (Qv+Ql) = no slip hold up, with Ql is liquid flow/volume and Qv is total volume/flowlabda g = Qg / (Qv+Qg)Calculation of the mixture density is then given by rho mixture = (rho l * labda l ^2)/Hl + (rho g * labda g ^2)/Hg
 jmw (Industrial) 15 Apr 11 5:33
 Perhaps this helps as background. I can't say if it is really relevant or not, sorry.http://www.google.co.uk/url?sa=t&source=web&cd=11&ved=0CBgQFjAAOAo&url=http%3A%2F%2Fpersonal-homepages.mis.mpg.de%2Fblesgen%2Fpp234093.pdf&ei=EBCoTd-zCY_A8QOp6tmnBg&usg=AFQjCNF6RMJzkLUtDojtnRh-ELXTrxzdhw&sig2=IwxXbgHebBk8sUM0UKiKwA

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