The corrosion problem of liquid desiccants hampers the development of liquid desiccant-based air-conditioning systems. Plastic surfaces can be a promising alternative because of their anti-corrosive property. However, plastic has the inherent problem of low wettability. The present experimental study investigated the regeneration performance of a liquid desiccant over multi-inline vertical polypropylene circular cylinder surfaces in an adiabatic mode, to find a substitute of vertical plate surfaces for developing low flow falling film towers. The mechanical surface modification method was explored to elevate the performance level of the circular cylinder surface. A comparative performance analysis was conducted between the circular cylinder and plate surface. It was found that the regeneration rate of the Conventional circular cylinder surface was superior to the Conventional plate surface by 50.5% for the evaluated conditions. The regeneration rate of the circular cylinder surface can