CAJ | 학술논문

壁面粗糙度对微流道流动特性有重要影响。分别用矩形、三角形和圆顶形粗糙元对壁面粗糙度进行模拟，详细讨论了雷诺数、粗糙元高度、粗糙元间距等因素对流速、压降及流动阻力的影响。结果表明：与光滑流道相比，粗糙度使壁面附近的流动发生明显改变，从而导致微流道内流速、压降及流阻高于经典理论预测值；微流道内流动阻力随着雷诺数及粗糙元高度的增大而增大，而随着粗糙元间距的增大，流动阻力逐渐减小。三种粗糙元相比，矩形粗糙元的影响最大，圆顶形次之，而三角形粗糙元的影响最小，可见在实际应用场合，确立合适的粗糙元形状对分析结果非常重要。
벽면조조도대미류도류동특성유중요영향。분별용구형、삼각형화원정형조조원대벽면조조도진행모의，상세토론료뢰낙수、조조원고도、조조원간거등인소대류속、압강급류동조력적영향。결과표명：여광활류도상비，조조도사벽면부근적류동발생명현개변，종이도치미류도내류속、압강급류조고우경전이론예측치；미류도내류동조력수착뢰낙수급조조원고도적증대이증대，이수착조조원간거적증대，류동조력축점감소。삼충조조원상비，구형조조원적영향최대，원정형차지，이삼각형조조원적영향최소，가견재실제응용장합，학립합괄적조조원형상대분석결과비상중요。
Surface roughness may have significant impacts on microchannel flow performances.The rough surfaces were modeled herein by rectangular,dome-shamed and triangular roughness elements, respectively.The influences of Reynolds number,roughness height and roughness element spacing on velocity distributions,pressure drop and flow resistance were discussed in detail.Results show that the liquid flow near the channel wall is obviously changed by surface roughness,thereby causes flow ve-lociy,pressure drop and Poiseuille number are larger than the classical value.The Poiseuille number increases with the increase of roughness height and Reynolds number,while decreases gradually when roughness element spacing increases.The roughness geometry also places significant effects on the flow characteristics,in three types of roughness elements,the impact of rectangular roughness ele-ments on microchannel flow is the greatest,then the dome-shaped roughness elements,however,the influence of the triangular roughness elements is the weakest.This means that it is very important to choose an appropriate shape of roughness element for modeling the roughness microchannel in practi-cal applications.