Abstract
Thermal propagation in heat spreader is observed and investigated with numerical visualization technique comparing with the analytic modeling. From the numerical results, three different modes of 3-D thermal propagation are found and are verified with the analytic model. Transient spreading phenomena in limited thickness with constant heat transfer boundary has not yet been modeled for various heat input as time function. The observation provides the behavior of the individual stage of transient spreading and the basis of the approximate function which fits the numerical calculation over the practically wide range of time. The approximation is done by simulated electrical circuits so that any time-function for heat input is able to be analyzed.
