Numerical Computation Of Temperature Field In An LED Color Printer

LED printers occupy a large part of market because of its advantage in technique and performance. However, compact conformation and fast print speed bring high temperature to printer, in which will be too high to keep its fast print speed and high print quality. Based on the method of numerical computation, this paper conducts the simulation analysis of the printer internal temperature field, it's also a basis of thermal performance analysis and optimization in thermal design.The 3-D models of printer are built and the numerical computation of thermal field are conducted by applying heat transfer/fluid software FloEFD. For the standby state, internal temperature field are simulated under the condition of free convection and forced convection for stable and transit state, and the distribution of stable temperature field and the dynamic temperature are both gained. Based on the simulated results, the different effect of the two heat dissipating means are analyzed. For the print state, research and proposed two methods: Discretization of the continue time and solid medium, and fluid replaced moving solid, they are adopted in the temperature field simulation of single and continue print separately, the temperature field of printer, temperature of key components and also the dynamic temperature field during the period of continue print are gained.In order to verify the results of numerical computation, a temperature measurement system based on PT100 resistance sensor is presented to measure internal temperature of the printer under various work condition, the temperature signals are collected by Agilent 34980A data acquisition and stored in computer. Comparisons between measurement and simulated temperature in same work condition show that:measurement results show good agreement with the simulated results in any work condition, the accuracy of numerical computation is verified.