# DPM: Heating Laws

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

 February 16, 2007, 12:21 DPM: Heating Laws #1 AndiG Guest   Posts: n/a Hello, 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, Andi

 February 16, 2007, 15:18 Re: DPM: Heating Laws #2 Allan Walsh Guest   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.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post sega Fluent UDF and Scheme Programming 3 April 13, 2014 21:58 igorb FLUENT 1 May 30, 2012 00:06 HP FLUENT 4 April 5, 2012 04:39 Nikhil Dani FLUENT 0 January 1, 2009 12:58 Mottle FLUENT 2 August 10, 2006 02:57

All times are GMT -4. The time now is 01:06.