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All Journal Jurnal Kedokteran JURNAL TEKNOLOGI TECHNOSCIENTIA
Puspitasari, Susi
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Earth & Planetary Sciences Engineering Health Professions Medicine & Pharmacology

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STUDI EKSPERIMEN PENGARUH POROSITY RATIO PADA PERFORATED TWISTED TAPE INSERT TERHADAP KARAKTERISTIK HEAT TRANSFER DAN FRICTION FACTOR PADA PENUKAR KALOR PIPA GANDA Puspitasari, Susi; Safitra, Arrad Ghani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v11i2.806

Abstract

Heat exchanger is used device to transfer thermal energy (enthalpy) between two or more fluids at different temperatures. One type of heat exchanger is double pipe heat exchanger. Double pipe heat exchanger consists of one pipe placed concentrically in another pipe with a larger diameter. One fluid passes through the inner pipe and the other fluid passes through the outer pipe (annulus). Performance of double pipe heat exchangers can be determined based on the characteristics of heat transfer and friction factor. One effort to improve the performance of double pipe heat exchanger can by passive method which is adding perforated twisted tape in the inner pipe. Perforated twisted tape had three different porosity ratios, that is 1.88, 3.77, and 5.65% that comparison with plain twisted tape (porosity ratio 0). Fluid flowed in double pipe heat exchanger is water in liquid phase in laminar-transition flow regime. Reynolds number in annulus is made constant at 2000, while in inner pipe is 1000-5000. Temperature of water entering annulus and inner pipe is kept constant at 20ºC and 50ºC, respectively. From the experimental results it found that perforated twisted tape increased Nusselt number and friction factor values respectively 0.1-0.8% and 203-1536% higher than double pipe heat exchanger without twisted tape (plain tube). Perforated twisted tape with porosity ratio 3.77% has the best performance, that is increasing Nusselt number average of 0.31% from 28.8913 in plain tube to 28.9810 and increasing friction factor average of 366.34% from 0.6521 in plain tube to 3.0410.
HUBUNGAN ANTARA SIKAP TERHADAP PENELITIAN DAN HAMBATAN PENELITIAN DENGAN KETERLIBATAN DALAM PENELITIAN MAHASISWA FAKULTAS KEDOKTERAN UNIVERSITAS MATARAM Puspitasari, Susi; Susani, Yoga Pamungkas; Maulana, Akhada
Jurnal Kedokteran Vol 10 No 2 (2021): Jurnal Kedokteran Juni 2021
Publisher : Faculty of Medicine Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jku.v10i2.490

Abstract

Background: conducting research is beneficial for the future of a medical doctor, but the medical students in Mataram University have unsatisfactory results in the course of research methodology. Research is also a determinant of the quality of a university. In a medical study, students are required to review or conducting relevant research as the proponent of their professionalism as long life learner. Regarding this study, it aims to measure the relationship of attitude and barriers towards research experiences of students in the medical faculty of Mataram University. Method: this study belonged to a quantitative study with a cross-sectional survey design. The subjects in this study were 129 medical students from a total of 140 of medical students in Mataram University in their 3-year and 4-year study. They have taken a research methodology course as the prerequisite to fill Revised Attitude Towards Research (R-ATR) questionnaire to measure attitude toward research, the questionnaire for both barriers and research experiences. Data from this study were analyzed using Spearman correlation. Results: Attitude toward research and research experience have small and positive correlation (r=0,322;p <0,001), while research barrier is small and negatively correlated towards research experience (r=-0,209;p <0,05). Conclusion: attitudes and barriers can be the factors that affected the frequency of student’s experiences in research.
Co-Authors Akhada Maulana, Akhada Arrad Ghani Safitra Yoga Pamungkas Susani