Comparison of Drag Reduction Effect on Barge Model Ship Using Ultrafine Bubble and Microbubble Injection

nergy efficiency is a global goal in the fight against warming. Research on reducing drag one of ways to improve energy efficiency. The research method used injection micro-sized bubbles and ultra-fine barge ship model. Microbubble Drag Reduction (MBDR) Ultrafine Bubble (UFBDR) are two methods that can play an essential role surface ship's hull. Factors affect effectiveness these ratio, location, coefficient produced by both methods. discussed use method, which was reviewed 2-meter towing tank compared results provided this determine ratio optimum location model compare effect coefficient. increases total resistance reduction 6.87% microbubble injection.