Puspitasari S, Safitra AG. STUDI EKSPERIMEN PENGARUH POROSITY RATIO PADA PERFORATED TWISTED TAPE INSERT TERHADAP KARAKTERISTIK HEAT TRANSFER DAN FRICTION FACTOR PADA PENUKAR KALOR PIPA GANDA. TECHNOSCIENTIA [Internet]. 2019 Feb. 1 [cited 2024 Aug. 30];11(2):121-7. Available from: https://ejournal.akprind.ac.id/index.php/technoscientia/article/view/806