The objective of this research is to enhance the aerodynamic performance and user experience of next-generation premium hair dryers by visualizing and optimizing both internal and external flow fields. Specifically, the study aims to strengthen the Coanda effect by improving the external geometry, thereby increasing airflow concentration and efficiency. Additionally, it seeks to reduce operational noise by refining the internal structure based on a thorough analysis of the internal flow. To achieve these goals, external flow is visualized using Particle Image Velocimetry (PIV), which captures high-resolution velocity fields and assesses the formation of the Coanda effect. Internal flow is examined through Magnetic Resonance Velocimetry (MRV), allowing for non-invasive, three-dimensional visualization of the complex internal flow structures. The ultimate goal of the research is to provide engineering insights that can inform the aerodynamic design and noise reduction strategies necessary for developing high-performance hair dryers. This research is conducted at the Experimental Fluid Dynamics Laboratory (EFD Lab) at Hanyang University and is supported by an industry-academic collaboration with LG Electronics.