Development of Wind Tunnel for Ultrafine Palm Oil Fuel Ash SeparatorSylvester Kenneth Sedah, Ana Sakura Zainal Abidin, A. Rigit, Mohd Azlan Ismail, Raudhah Ahmadi and Md Abdul MannanMATEC Web Conf., 87 (2017) 02009DOI: https://doi.org/10.1051/matecconf/20178702009