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Teguh Wibowo
Universitas Muhammadiyah Purworejo
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Journal : Vortex

 1 
EXPERIMENTAL STUDY OF COOLING SPRAY METHOD ONTO INCLINED HEATED SURFACES Wibowo, Teguh; Hermawan, Dedet; Prakoso, Agung
Vortex Vol 3, No 1 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (905.501 KB) | DOI: 10.28989/vortex.v3i1.1164

Abstract

Single droplet impingement onto inclined heated surface is studied experimentally. Droplet in the form of aquades is dropped from a fixed height 70 mm to the metal surface with 45º impact angle. This experiment uses 3 types of metals; Stainless Steel AISI 304, Aluminum Alloy 2024, and Copper. All material surfaces are mirror polished and assumed to have the same surface treatment condition. Surface temperatures are 110 ºC, 150 ºC and 210 ºC to determine droplet behavior characteristics. The droplet has 3.0 mm diameter and 28.5 Weber Number (low impact category). In order to analyze droplet behavior in slow motion high velocity camera 4000 fps (frames per second) is used with image resolution 1024 x 768. Data obtained then processed using MATLAB image processing technique to analyze sequence of images visually and quantitatively to determine several parameters; spreading ratio, dimensionless height and contact time.The results showed droplets have different behavior characteristics even at the same surface temperature. Droplet contact time on the copper surface is shorter than aluminum and stainless steel. This is because droplets experienced bouncing due to film boiling regime takes place earlier. Maximum spreading ratio of stainless-steel surfaces is higher than copper because changes of boiling regime on stainless steel surfaces are slower and droplet is still experiencing spreading on the surface
PENGARUH MODE PEMBEBANAN MEKANIKA RETAKAN TERHADAP FATIGUE CRACK GROWTH RATE PADA STRUKTUR DOUBLER FUSELAGE SKIN PESAWAT BOEING 737-900ER Seran Luan, Randi Edward; Hartini, Dwi; Wibowo, Teguh; Prattiwi, Elisabeth Anna; Santoso, Djarot Wahju
Vortex Vol 6, No 1 (2025)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v6i1.2729

Abstract

Instalasi doubler dinyatakan aman di bawah Structural Repair Manual (SRM). Namun kemampuan menahan beban siklik tidak disebutkan secara eksplisit dalam SRM. Pembebanan siklik dapat menyebabkan kegagalan yang berhubungan dengan kelelahan. Penelitian ini didasarkan pada asumsi mekanika retak mode pembebanan II, dan analisis laju pertumbuhan retak dan siklus kelelahan dilakukan dengan menggunakan metode numerik MVCCI. Hasil penelitian menunjukkan bahwa nilai laju pertumbuhan retakan terendah adalah panjang retakan 8,5 mm pada kondisi terbang 5000 ft, yaitu 5,045×10-14 mm/siklus, dan nilai tertinggi adalah panjang retakan 51 mm. Pada kondisi penerbangan 40.000 kaki, ini akan menjadi 1,762×10-10 mm/siklus.
Co-Authors . Limbong, Benny L ., Erdian Abhiyantara, M. Radhiya Salman Adnan, Mazlini Ageng Triyono Agung Pambudi Agung Prakoso Agustiana Wijiastuti Wahyudi Ahsyariyah Zulfi Hafidhoh Akbar, Rafly Putra Al-Amin, Al-Amin Alfina Sukma Amaliyah, Dina Inti Anisa Dewi Anugrah Dwi Cahyani Apriyanto, Bambang Arie Purwa Kusuma Arifiyanto Hadinegoro, Arifiyanto Aris Aryanto Arohman Taufik Arum Ratnaningsih Azieta, Haliza Nur Bachtiar Arif, Bachtiar Bagus Suryo Kusumo Bambang Priyo Darminto Bambang Priyo Darminto Batubara, Rizki Wulanita Benedictus Mardwianta, Benedictus Bisri Zainudin Budi Hartono Budiyono Budiyono Budiyono Budiyono Cahyo Apri Setiaji Citra Asti Rosalia Danti, Vivi Inta Dedet Hermawan Setiabudi, Dedet Hermawan Dion Rapanca Dita Yuzianah Djarot Wahju Santoso Drajat Indah Mawarni Dwi Hartini Dyah Panuntun Utami Edi Riyanto Effendy, Yudi Eko Poerwanto Eko Syaiful Anwar Eko Teguh Paripurno Eli Kumolosari Erni Puji Astuti Faiz, Muhammad Ikhsan FAJAR NUGROHO Faradila, Lisa Febryanto Kurniawan Ferry Budhi Susetyo Fidyaningsih, Anik Fiki Alghadari Fransisca Soetanto, Maria Freddy Kurniawan Haliza Nur Azieta Hananto Purbonugroho Haris Subarjo, Abdul Herlina Budiarti Hermawan, Dedet Heru Kurniawan Hidayah, Mila Rohmah Ika Septiana Intania Shafa, Salsabila Irma Mangar Iryani, Lenny Islami, Zaim Sidqi Ismail, Muhammad Ridwan Isnaeni Maryam Isnaeni Maryam Istiko Agus Wicaksono Jalaali, Bahrul Jayanti Putri Purwaningrum Khoeriah, Faridatul Kurniawan, Febryanto Lukman Fadhiliya Luthfi, Mochammad Ma'ruf, Abdul Hakim Maulana, Shaugi Rahkman Mazlini Adnan Megasari Wuryanie Muflikhah, Desi Muhammad Hisyam Muhammad Ikhsan Faiz Mujiyem Sapti Mujiyem Sapti Mujiyem Sapti Nafida Hetty Marhaeni Nila Kurniasih Nuary, Rusdi Hamdany Nugrahajati, Susilastuti Dwi Nunung Wahyu Puspita Nur Akhmad Triwibowo, Nur Akhmad Nur Halimah Nur Mala Nurimani Nurimani Nurul Hidayah Okto Dinaryanto Permatasari, Nisa Pinandhita, Lazuardy Rahendra Prasetia, Endra Prasetyo Budi Darmono Prasetyo, Cahyo Purnomo Pratiwi, Indah Prattiwi, Elisabeth Anna Puji Nugraheni Purba, Rakhmawati Purwaningsih, Wharyanti Ika Putranto, Dwiyono Rahayu, Eko Sri Rahayu, Wita Rahma Fajri Nailah Rama Sahtyawan Rani Anggrainy Riawan Yudi Purwoko Risa Oktaviani, Risa Rismi Annisa Riyanto, Edi Romadhoni, Moh. Gufron Rully Charitas Indra Prahmana Rusdi Hamdany Nuary Rusdyi Habsyi Rusmin R. M. Saleh sahudi, suwarno Saryati Saryati Seran Luan, Randi Edward Shalihah, Nurina Fairuz Siahaan, Rumiris Sinung Nugroho, Yohanes Sobirin, Rasya Fajar Soeprianto, Agus Sri Kustilah Sri Mulyanti Sriyono Sriyono Subagjo, Ichwal Sujiono Sujiono, Sujiono Sumari, Arwin Datumaya Supriyono Supriyono Suradi Kartanegara, Radi Susianti, Elena Susilo, Tarsisius Sutarno, Sutarno Syarif Hidayat Tanjung, Rosdiana Imroati Kurnia Taufik, Arohman Tri Swaraswati Tutuk Ningsih Ummu Qo'is Wahju Tjahjo Saputro Wharyanti Ika Purwaningsih, Wharyanti Ika Wijaya Damayanti, Aurelia Wahda Winaryuni, Nevia Indah Yasin, Bukhari Yuana, Kumara Ari Yulia Aulia Rahmah Yuni, Yatha Zaim Sidqi Islami Zainudin, Bisri Zuhri, Muhammad Rizki