Trouble with an iterative function

• To: mathgroup at smc.vnet.net
• Subject: [mg40085] Trouble with an iterative function
• From: Miguel Gomes da Cruz <mgcruz at selway.umt.edu>
• Date: Wed, 19 Mar 2003 03:23:04 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Good day everyone,

I have problem trying to implement an iterative function that attempts to
estimate the temperature of a wood particle subjected to variable air
temperature (air temperature is function of time, e.g. Tair[t_]=600+t*5).
The function is the following (hc is the heat transfer coeficient):

Fignition[t_, hc_] :=
Block[{ Tfuel = Tini, Tini = 300, Fcp =
2100, Fd = 0.005, Fl = 0.1, ?f = 520,
FMC = 0.7, Wcp = 2417, Whv = 2257000},
{While[Tfuel < 373, Print[Tfuel]; Save["test01.dat", Tfuel];{S =
?f*Fv[
Fd, Fl]*(Fcp + (Wcp*FMC));
Q = hc*Fa[Fd, Fl]*(Tair[t] - Tfuel);
Xtp = Tfuel + (Q/S);
Tfuel = Xtp}]}
{While[Tfuel > 373, Print[Tfuel]; Save["test01.dat", Tfuel]; {
S = ?f*Fv[Fd, Fl]*(Fcp);
Q = hc*Fa[Fd, Fl]*(Tair[t] - Tfuel);
Xtp = Tfuel + (Q/S);
Tfuel = Xtp}; If[Tfuel > 600, Break[]]
]
}
]

My problem is that I want the Fignition[t_, hc_]  function to be computed
for each time step by reading the Tair at that time step. the time step
should be the iterator. Currently the function does its thing but uses a
fixed Tair.
Hpe I was clear. Thanks
Miguel

********************************************
Miguel Cruz
460 "The Bullpen" Science Complex
School of Forestry
University of Montana
Missoula, MT 59812

Phone: (406) 329 4748 (@ FiSL)
Fax:   (406) 329 4825 (@ FiSL)
********************************************

```

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