CFD Online Logo CFD Online URL
Home > Forums > FLUENT

DPM: Heating Laws

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   February 16, 2007, 12:21
Default DPM: Heating Laws
Posts: n/a

Iīve got a problem with DPM. I want to inject solid particles in a continous phase. The solid particles are heated up there and reach a temperature that is above the melting point. In the basic Fluent heating-laws there is only a vaporization-law included. Could anybody give me UDF-Files which consider also the process of melting??

Here the suggested equations:

for T < Tm:

mp.cp.dT/dt = h.A.dT

for T > Tm:

mp.cp.dT/dt = h.A.dT + mp.dL/dt.Hsf

,where L==liquid fraction and Hsf==latent heat of melting

How can I calculate the liquid fraction? (which Formula)?

Or can somebody tell me how to create such laws/udf-files??

(I already read that it works via the DEFINE_DPM_LAW, perhaps somebody could also give me an example-udf-file for defining a dpm-law, i didnīt find an example in the udf-manual for such a case)

Any help will be greately appreciated,

  Reply With Quote

Old   February 16, 2007, 15:18
Default Re: DPM: Heating Laws
Allan Walsh
Posts: n/a
You could write a UDF using the DEFINE_DPM_LAW, if you are familiar with UDFs. The example in the manual will give you the basic idea. But, it may take you awhile (a few weeks) to code up what you want.

Why don't you try this: - treat the particles as inert - in the material property panel for the inert particle, adjust the particle specific heat as a function of temperature with the piecewise function. At the particle melting temperature, use a specific heat that also includes your latent heat of fusion. At higher temperatures, use a third specific heat relationship.

  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
DPM - Solid reaction sega Fluent UDF and Scheme Programming 3 April 13, 2014 21:58
Custom DPM Laws igorb FLUENT 1 May 30, 2012 00:06
DPM Standard Laws? HP FLUENT 4 April 5, 2012 04:39
DPM - do the particles affect the liquid? Nikhil Dani FLUENT 0 January 1, 2009 12:58
DPM Laws Mottle FLUENT 2 August 10, 2006 02:57

All times are GMT -4. The time now is 00:48.