CAJ | 학술논문

在 1 mm×1 mm 矩形截面下微通道内,以二氧化碳-水为工作流体,研究壁面润湿性和气液表观流速对气-液两相流型和气液传质的影响,并研究了气、液表观流速对弹状流流体力学性质的影响.在亲水微通道中观测到了泡状流、泡状-弹状流、弹状流;在疏水微通道中观测到了非对称弹状流、拉长的非对称弹状流、分层流.实验表明亲水微通道中弹状流区域下气泡长度大体上随气相表观流速的增大而增大,随液相表观流速的增大而减小;液弹长度大体上随气相表观流速的增大而减小,随液相表观流速的增大先增大后减小;液侧体积传质系数 kLa 均随气、液相表观流速的增大而增大,随通道壁面润湿性的增强而增大.
재 1 mm×1 mm 구형절면하미통도내,이이양화탄-수위공작류체,연구벽면윤습성화기액표관류속대기-액량상류형화기액전질적영향,병연구료기、액표관류속대탄상류류체역학성질적영향.재친수미통도중관측도료포상류、포상-탄상류、탄상류;재소수미통도중관측도료비대칭탄상류、랍장적비대칭탄상류、분층류.실험표명친수미통도중탄상류구역하기포장도대체상수기상표관류속적증대이증대,수액상표관류속적증대이감소;액탄장도대체상수기상표관류속적증대이감소,수액상표관류속적증대선증대후감소;액측체적전질계수 kLa 균수기、액상표관류속적증대이증대,수통도벽면윤습성적증강이증대.
An experimental investigation was conducted with a high-speed camera to explore the hydrodynamics characteristics of slug flow in a microchannel with a cross-section of 1 mm×1 mm. Pure carbon dioxide and water were used as working fluids. The influence of superficial gas and liquid velocities and the wettability of microchannel on the two-phase flow pattern and mass transfer was investigated. In the hydrophilic microchannel, bubbly flow, bubbly-slug flow and slug flow were observed. In the hydrophobic microchannel, asymmetric slug flow, elongated asymmetric slug flow, stratified flow were found. It was shown that in slug flow of the hydrophilic microchannel, the length of bubble increased generally with the increase of superficial gas velocities and the decrease of superficial liquid velocities. The length of liquid slug decreased generally with the increase of superficial gas velocities, and increased firstly and then decreased generally with the increase of superficial liquid velocities. As the improvement of superficial gas and liquid velocities, the liquid volumetric mass transfer coefficient kLa increased. The liquid volumetric mass transfer coefficient kLa in the hydrophilic microchannel was higher than that in the hydrophobic microchannel.