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KARAKTERISTIK PENDIDIHAN DALAM CELAH SEMPIT REKTANGULAR VERTIKAL DENGAN VARIASI TEMPERATUR AWAL PLAT Catrawedarma, I Gusti Ngurah Bagus; Indarto, Indarto; Juarsa, Mulya
Media Mesin: Majalah Teknik Mesin Vol 18, No 1 (2017)
Publisher : Universitas Muhammadiyah Surakarta

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Analisis perpindahan kalor pendidihan untuk mengetahui pengaruh temperatur awal plat utama terhadap karakteristik pendidihan yang meliputi waktu rewetting, pola rewetting, fluks kalor, serta Critical Heat Flux (CHF) telah dipelajari berdasarkan kurva pendidihan dan fluks kalor yang dihitung dari transien temperatur permukaan plat, yang merupakan hasil eksperimen dengan menggunakan 2 plat vertikal dengan celah sempit antar plat utama dan penutup adalah 1 mm. Debit dan temperatur air pendingin ditetapkan sebesar 0,09 lt/detik dan temperatur saturasi. Temperatur awal plat utama divariasikan dari 500oC, 550oC, dan 600oC. Hasil analisis menunjukkan bahwa waktu rewetting terendah sebesar 30 sekon dan tertinggi sebesar 290 sekon. CHF tertinggi sebesar 750 kW/m2 dan terendah sebesar 400 kW/m2. Semakin tinggi temperatur awal plat, maka semakin lama waktu rewettingnya. Perubahan temperatur awal plat utama tidak mempengaruhi pola rewetting. Semakin tinggi temperatur awal plat, maka nilai CHF-nya semakin rendah. Daerah didih film tidak sesuai dengan kasus pool boiling. Pada daerah transisi, semakin rendah temperatur awal plat, maka semakin mendekati korelasi Murase. Nilai CHF mendekati korelasi Leinhard. Titik Leidenfrost sesuai dengan korelasi Zuber. Daerah didih inti mendekati korelasi Murase untuk superheat vapor.

ANALYSIS OF REWETTING TIME AND TEMPERATURE DISTRIBUTIONS DURING COOLING PROCESS IN VERTICAL RECTANGULAR NARROW CHANNEL Catrawedarma, Bagus; -, Indarto; Juarsa, Mulya; Antariksawan, Anhar Riza
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 6 No 1 Agustus 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Cooling process to analyze effect of gap size to rewetting time and temperature distributions were studied from transient temperature of surface plate. It as result of experiment using two vertical plate with the initial temperature about 600Â°C. Debit and temperature of cooling water are 0,09 L/s and saturated temperature. The gap sizes were changed from 1 mm, 2 mm, and 3 mm. As the results showed that the smaller the gap size, the longer the rewetting time. Pattern of temperature distribution is similar at initial condition for all of gap sizes and the smaller the gap sizes, the longer the time of decreasing temperature.

ANALISIS KURVA PENDIDIHAN DALAM CELAH SEMPIT VERTIKAL UNTUK KASUS BILATERAL HEATING BERDASARKAN PERUBAHAN TEMPERATUR AWAL PLAT Catrawedarma, IGN Bagus; Indarto, Indarto; Juarsa, Mulya; Handoyo, Ismu; Kiswanta, Kiswanta
MEKANIK: Jurnal Ilmiah Teknik Mesin Vol 1 No 2 (2015): November 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknologi Industri, Institut Teknologi Medan (ITM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.396 KB)

Analisis perpindahan kalor pendidihan untuk mengetahui pengaruh temperatur awal plat utama terhadap karakteristik pendidihan yang meliputi waktu rewetting, pola rewetting, fluks kalor, serta Critical Heat Flux (CHF) telah dipelajari berdasarkan kurva pendidihan dan fluks kalor yang dihitung dari transien temperatur permukaan plat, yang merupakan hasil eksperimen dengan menggunakan 2 plat vertikal dengan celah sempit antar plat utama dan penutup adalah 1 mm. Debit dan temperatur air pendingin ditetapkan sebesar 0,09 lt/detik dan temperatur saturasi. Temperatur awal plat utama divariasikan dari 500oC, 550oC, dan 600oC. Hasil analisis menunjukkan bahwa waktu rewetting terendah sebesar 30 sekon dan tertinggi sebesar 290 sekon. CHF tertinggi sebesar 750 kW/m2 dan terendah sebesar 400 kW/m2. Semakin tinggi temperatur awal plat, maka semakin lama waktu rewettingnya. Perubahan temperatur awal plat utama tidak mempengaruhi pola rewetting. Semakin tinggi temperatur awal plat, maka nilai CHF-nya semakin rendah. Daerah didih film tidak sesuai dengan kasus pool boiling. Pada daerah transisi, semakin rendah temperatur awal plat, maka semakin mendekati korelasi Murase (2001). Nilai CHF mendekati korelasi Leinhard. dkk (2002). Titik Leidenfrost sesuai dengan korelasi Zuber (1958). Daerah didih inti mendekati korelasi Murase (2001) untuk superheat vapor.

ANALYSIS OF REWETTING TIME AND TEMPERATURE DISTRIBUTIONS DURING COOLING PROCESS IN VERTICAL RECTANGULAR NARROW CHANNEL Catrawedarma, Bagus; -, Indarto; Juarsa, Mulya; Antariksawan, Anhar Riza
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 6 No 1 Agustus 2013
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v6i1.586

Cooling process to analyze effect of gap size to rewetting time and temperature distributions were studied from transient temperature of surface plate. It as result of experiment using two vertical plate with the initial temperature about 600Â°C. Debit and temperature of cooling water are 0,09 L/s and saturated temperature. The gap sizes were changed from 1 mm, 2 mm, and 3 mm. As the results showed that the smaller the gap size, the longer the rewetting time. Pattern of temperature distribution is similar at initial condition for all of gap sizes and the smaller the gap sizes, the longer the time of decreasing temperature.

Analisis Karakteristik Rewetting Dalam Celah Sempit Vertikal Untuk Kasus Bilateral Heating Berdasarkan Perubahan Temperatur Awal Plat IGN. Bagus Catrawedarma; Indarto -; Mulya Juarsa; Ismu Handoyo; Kiswanta -; Ririn Fitriana
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Boiling heat transfer to analysis of effect main plate initial temperature to rewetting characteristics that arerewetting time, and pattern of rewetting were studied from transient temperature of surface plate. It is as result of experimentusing two vertical plate with 1 mm narrow gap. Debit and temperature of cooling water were controlled about 0,09 lt/s andsaturated temperature. The initial temperatures of main plate were changed from 500°C, 550°C, and 600°C. As results shownthat midle part of main plat has the highest value of rewetting time that is 310 second at 600°C initial main platetemperature, the lowest rewetting time is 40 second at 500oC initial main plate temperature on the bottom part of plate. Thehigher the plate initial temperature, the longer the rewetting time and variation of the plate initial temperatures can notinfluent the pattern of rewetting.

Analysis of Rewetting Time and Temperature Distributions During Cooling Process in Vertical Rectangular Narrow IGN. Bagus Catrawedarma; Indarto Indarto; Mulya Juarsa
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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AbstractCooling process to analyze effect of gap size to rewetting time and temperature distributionswere studied from transient temperature of surface plate. It as result of experiment using twovertical plate with the initial temperature about 600°C. Debit and temperature of cooling waterare 0,09 L/s and saturated temperature. The gap sizes were changed from 1 mm, 2 mm, and 3mm. As the results showed that the smaller the gap size, the longer the rewetting time. Patternof temperature distribution is similar at initial condition for all of gap sizes and the smaller thegap sizes, the longer the time of decreasing temperature.Keywords: Cooling process, rewetting time, temperature distribution.AbstrakProses pendinginan untuk menganalisa pengaruh ukuran celah terhadap waktu pembasahandan distribusi temperatur diamati dari transient temperatur permukaan plat. Penelitiandilakukan menggunakan dua plat vertikal dengan temperatur awal 6000C. Debit dan temperaturair pendingin adalah 0,09 L/s dan temperatur jenuh. Ukuran celah divariasikan dari 1 mm, 2mm dan 3 mm. Hasil penelitian menunjukkan bahwa semakin kecil ukuran celah semakinpanjang waktu rewetting. Pola distribusi temperaursama pada kondisi awal untuk semuaukuran celah, semakin kecil ukuran celah semakin panjang waktu untuk penurunantemperatur.Kata kunci: Proses pendinginan, rewetting time, distribusi temperatur

Pengaruh massa air baku terhadap performansi sistem destilasi IGNB. Catrawedarma
Jurnal Energi Dan Manufaktur Vol 3, No.2 Desember 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Clean water is requirement of very important human life. One of the method to be used for obtain clean water is destillation process. Important matter in destillation process is evaporation and condensation process, influenced by heating of standard water. Heating process of this standard water will influence by mass of standard water to be heated. Mass standard water which many will cause heating process become requiring long time, so that from that thing is conducted by examination with variations of mass standard water in basin. Examination conducted to get data which in the form of mass and temperature condensat which is accomodated in reservoa. For the next, from the data conducted by calculation to know performance of destillation sistem which it form are destillation rate, product efficiency, and system efficiency for the variations of mass standard water. From result of data analysis and calculation, can know that happened fluctuation of system efficiency and destillation rate. System efficiency depended from ratio between condensation energi (qc) of energi enter system (qin). Destillation rate depended from condensat mass ratio a time difference. From result of calculation got that variation of 3 kg standard water giving the best value from is fifth of standard water mass variation of with value : destilas rate average equal to 3,829 gr/mnt, total product efficiency equal to 80,42 %, and total efficiency average equal to 22,67 %.

KARAKTERISTIK PENDIDIHAN DALAM CELAH SEMPIT REKTANGULAR VERTIKAL DENGAN VARIASI TEMPERATUR AWAL PLAT I Gusti Ngurah Bagus Catrawedarma; Indarto Indarto; Mulya Juarsa
Media Mesin: Majalah Teknik Mesin Vol 18, No 1 (2017)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v18i1.3948

PERANCANGAN MESIN PEMERAS LENDIR BIJI KAKAO (DEPULPER) TIPE ROTARY UNTUK MENINGKATKAN MUTU BIJI BUAH KAKAO DESA SUMBERAGUNG KABUPATEN BANYUWANGI Nuraini Lusi; Afandi Akhmad; Catrawedarma IGNB; Anam Chairul
ROTOR Vol 10 No 2 (2017)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

The purpose of this activity is to improve the productivity of the farmers in the success of cocoa fruit through the use of appropriate technology for the separation of coco seeds / squeezer machine, with the application of this technology is expected to assist farmers in the production process so that the quality results of cocoa produced will be more optimal. Cocoa bean separator machine serves to accelerate the process of separation of salut which during this process is still manually and takes a long time. This salute separator machine as much as possible the process is easy and the results are really on target. The main objective of making cocoa depulper is to assist cocoa farmers in the process of harvesting and improving the quality of crops so that the needs of cocoa farmers can be fulfilled. Keywords: cocoa, salute, depulper, rotary system

PENGUJIAN TERMAL PENGERING GABAH UNFIXED FLATBED I Gusti Ngurah Bagus Catrawedarma; halil halil
ELEMEN : JURNAL TEKNIK MESIN Vol 5 No 2 (2018)
Publisher : POLITALA PRESS

Thermal testing of unfixed flatbed dryers was carried out on natural convection heat transfer. Its specifications are 4 number of bed level, using 1/4 Hp and 1400 rpm electric motor power and rotation, 1:60 gearbox ratio, A type of V belt with a length of 686 mm, pulleys diameter of 95 mm, and the shaft diameter of 12 mm in made sB = 70.2 kg / mm2 of the materials. Tests were carried out to determine the thermal performance of the dryer such as the amount of input energy, the energy used to evaporate the water contained in the grain, and its distribution for each level of the bed. The test results revealed that with the input energy of 6.396 kW, it took 125 minutes to evaporate the water in the rice, and the highest thermal efficiency on the 2nd level from the bottom.

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