N. KOOLNAPADOL และ S. SRIPATTANAPIPAT and S. SKULLONG. (2016) Effect of pitch spring of delta-winglets on thermal characteristics in a heat exchanger tube. <i>Journal of Research and Applications in Mechanical Engineering</i>, <i>4</i>(2), 166 -174.N. KOOLNAPADOL และ S. SRIPATTANAPIPAT and S. SKULLONG. "Effect of pitch spring of delta-winglets on thermal characteristics in a heat exchanger tube". Journal of Research and Applications in Mechanical Engineering 4 (2016):166 -174.N. KOOLNAPADOL และ S. SRIPATTANAPIPAT and S. SKULLONG. Effect of pitch spring of delta-winglets on thermal characteristics in a heat exchanger tube. Thai Society of Mechanical Engineers:ม.ป.ท. 2016.