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A newly developed green membrane for juice clarification has been successfully made by utilizing natural antibiofoulant impregnated cellulose acetate mixed matrix membranes. The extract impregnated into cellulose acetate polymer to form mixed matrix membranes with higher and foodgrade antibiofouling properties. In order to evaluate mixed matrix membrane mass transport, a specialized mini membrane modules (mMm) has been developed. The mini membrane module has ring-shaped stainless stell plates with 160 mm outer diameter and 100 mm inner diameter. A couple of 10 mm thick circular PMMA plates with diameter 120 mm mounted between two halves of the ring-shaped stainless stell plates. A coupon of mixed matrix membranes placed within the circular plates with customized grooves thickness to place feed spacer and permeate spacer mimicking the configuration of industrial scale spiral-wound membrane modules. The used of circular PMMA plates allows direct monitoring of membrane mass transfer without disturbing the process. This study utilizing computational fluid dynamics (CFD) simulation to evaluate fluid distribution in rectangular, quadrilateral and circular narrow channels. Three different superficial velocities which are normally found in spiral wound membrane modules were evaluated, i.e. 0.11, 0.16 and 0.2 m/s. Trans-membrane pressure normally used in ultrafiltration processes were evaluated, i.e. 0.5, 1.0, and 1.5 bars. Based on CFD analysis, circular channel provides a more uniform and distributed velocity stream compare to the others. The circular shape also provide advantage on managing superficial feed flow inside the membrane channel, compared with rectangular and quadrilateral shapes channel. The mini membrane modules potentially reduces laboratory scale research cost, while maintaining the similar operating variables of larger scale.