Heat transfer dynamics inside the Drop-on-Demand inkjet printhead with a hybrid thermal lattice Boltzmann model
Heat transfer dynamics inside the Drop-on-Demand inkjet printhead with a hybrid thermal lattice Boltzmann model
复制标题
采用混合热晶格玻尔兹曼模型的按需喷墨打印头内部的传热动力学
DOI：
10.1016/j.applthermaleng.2019.113789
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发表时间：
2019
影响因子：
6.4
通讯作者：
Cheng Xiaoding
中科院分区：
文献类型：
--
作者：
Zhang Lei;Cheng Xiaoding
按需喷墨（DoD）打印头内部的热传递动力学对于改善温度补偿和喷射再现性起着重要作用。采用三维混合热格子Boltzmann模型研究了DoD墨滴喷射过程中墨室内的温度分布。研究了由锆钛酸铅（PZT）变形引起的壁面加热和与加热衬底耦合的热源的情况。研究发现，液滴喷射过程中的速度场阻碍了从热壁到墨室中心的等温线演变。入口区和出口区附近的温度场受温度较低的热边界的影响，呈现弯月面等温线。由于对流换热和射流动力学速度场的共同作用，耦合热源的整体温度分布获得更快的稳定状态。此外，在中心下部区域的温度分布表现出涡结构。总之，我们说明了油墨室内温度分布的时间演变，并提供了一个深入的探索传热动力学耦合速度场。这对探索第一滴的差异性和改善温度补偿是有益的。
The heat transfer dynamics inside the Drop-on-Demand (DoD) printhead play a significant role for improving temperature compensation and jetting reproducibility. A three-dimensional hybrid thermal lattice Boltzmann model is employed to explore the temperature distributions within the ink chamber in DoD droplet jetting process. The scenarios including heated walls resulting from deformation of lead zirconate titanate (PZT) and heat sources coupled with heated substrate are investigated. It is found that the isotherms evolutions are hindered from heat walls to the center of ink chamber by the velocity fields during the droplet jetting process. The thermal fields adjacent to the inlet and outlet regions are affected by the thermal boundaries with lower temperature and exhibit meniscus isotherms. Attributing to the combined effects of advection-dominated heat transfer and velocity fields of jetting dynamics, the overall temperature distributions obtain the quicker stabilized status for coupled heat sources. Moreover, the temperature distributions in the lower-center region exhibit the vorticial structure. In summary, we illustrate the temporal evolutions of temperature distributions within ink chamber and offer an in-depth exploration of heat transfer dynamics coupled with velocity fields. It could be beneficial for exploring the first droplet dissimilarities and improving the temperature compensation.