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Drajat Indah Mawarni
Sekolah Tinggi Teknologi Ronggolawe Cepu
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Kaji Eksperimental Efek Separasi Flow Pada Arah Radial Terhadap Performa Rectangular Elbow Dengan Variasi Bilangan Reynolds Drajat Indah Mawarni
SIMETRIS Vol 9 No 1 (2015): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

This study aimed to determine the effects of flow separation on the distribution pattern statics pressure recovery in the flow through the rectangular elbow. The study was conducted experimentally by measuring the static pressure at the area of radius r at the center of curvature. Pressure measurements were made with three variations of the Reynolds number (Re). The results of the measurement of static pressure generally indicates that the flow pattern in the radial direction is formed does not undergo significant changes with the change of Reynolds number / flow rate. The results of measurement obtained information that has outerwall side pressure coefficient (Cp) is positive, while in the inner side wall has a pressure coefficient (Cp) is negative. This shows that the outer side has a greater pressure than the inner side. In the radial direction the pressure coefficient (Cp) increased as you bend radius of curvature rectangular, which means that the larger the finger - the finger curvature, stress the fish is also getting bigger. This research has not found any effect on the pattern of change in Reynolds number and flow characteristics that form the radial direction passing through the channel testing.
KAJI EKSPERIMENTAL KECEPATAN PEMISAHAN BIODIESEL/GLISERIN TERHADAP KONSENTRASI TETESAN Drajat Indah Mawarni
SIMETRIS No 18 (2014): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Kajian ini bertujuan untuk mengetahui tingkat kecepatan pemisahan (creaming velocity) antara dua fluida yang berfasa sama namun memiliki perbedaan densitas. Kajian ini dilakukan secara eksperimental dengan mengamati dan mengukur waktu pisah (settling time) pada tabung kaca dengan variasi diameter.Pengukuran waktu pisah dilakukan lima kali untuk setiap diameter tabung. Waktu pisah yang di peroleh digunakan sebagai dasar untuk menghitung diameter tetesan/droplet, konsentrasi tetesan, kecepatan pemisahan/creaming velocity dan Vstokes. Hasil perhitungan yang di peroleh diploting untuk membandingkan nilai konsentrasi tetesan (droplet consentration/Φ) terhadap kecepatan pemisahan (creaming velocity) pada campuran biodiesel/gliserin dan untuk mencari nilai Φc (fraksi volume fase biodiesel yang terdispersi rapat dalam gliserin/konsentrasi tetesan) dan k (konstanta pemisahan). Dari penelitian ini dapat disimpulkan bahwa semakin tinggi nilai konsentrasi tetesan (Φ) maka kecepatan pemisahannya (V cream) akan semakin berkurang dan dari persamaan Hunter bahwa V = Vstokes(1- )k.Φc , maka didapatkan nilai k dan Φc masing – masing adalah (5,1 ; 0,6 ; 1,2) dan (0,461 ; 0,9 ; 0,69) pada percobaan I, II, III dengan diameter tabung (1,3 ; 2,8 ; 3,9) cm.
PEMBERSIHAN SAMPAH DI DASAR SUMUR MINYAK UNTUK MENINGKATKAN PRODUKSI Agus Dwi Korawan; Drajat Indah Mawarni
SIMETRIS Vol 12 No 1 (2018): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Oil wells in Ledok village, Blora regency are old wells from the Dutch era, the wells are managed by local community groups, Crude oil from the wells are taken by Pertamina, partners get rewarded according to the specified price. Partner in the Community Partnership Program (PKM) activities is L212 oil well, the chairman is Mr. Agus Purwanto. Based on the analysis of the situation, the problem in this well is that a lot of garbage at the bottom of the well, this garbage prevents the source of oil coming out, as a result the crude oil is produced a little. The purpose of the PKM program is to increase the ability of partners and increase crude oil production. The method used is discussion, training, and mentoring. The results obtained from the implementation of PKM are skills enhancement and increased production capacity
Pengaruh Debit Fluida Air terhadap Distribusi Diameter Bubble pada Microbubble Generator Tipe Orifice-Porous Tube Drajat Indah Mawarni; Agus Dwi Korawan
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Microbubble generator merupakan alat yang dapat menghasilkan gelembung atau bubble berukuran mikro. Penelitian ini mempelajari pengaruh aliran swirl yang diciptakan oleh cyclone pada microbubble generator tipe orifice 12 mm dengan menggunakan porous tube dari stainless steel wire mesh ukuran 300 terhadap distribusi diameter bubble yang dihasilkan. Penelitian ini menggunakan Microbubble generator tipe orifice karena memiliki bentuk yang sederhana dan proses manufaktur yang mudah. Untuk meninjau performa dari microbubble generator dapat digunakan beberapa parameter yaitu, hydraulic power (Lw), pressure drop, dan distribusi diameter bubble yang terbentuk. Pada penelitian ini, performa atau karakteristik microbubble generator dipelajari dengan melakukan penelitian pengaruh perubahan debit air (Q­L) terhadap distribusi bubble yang dihasilkan.Debit aliran yang digunakan mempunyai rentang antara 30 lpm – 60 lpm serta distribusi diameter bubble yang dihasilkan diakuisisi dengan menggunakan high speed camera. Berdasarkan hasil penelitian menghasilkan bubble dengan probabilitas tertinggi pada rentang diameter 300 – 450 µm.
Analisis Potensi Daya Mekanis Yang Dihasilkan Konverter Energi Metode Bandul Vertikal Di Air Tenang Hendri Suryanto; Drajat Indah Mawarni
SIMETRIS Vol 13 No 2 (2019): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Hydroelectric power plants have been widely developed. One that is mostly built especially in mountainous or highland areas is power plants that use falling water energy or river water currents to turn turbines connected to generators. In coastal areas today power plants have been developed using abundant sea waves known as the Wave Energy Converter (WEC), with one of the methods used is the pendulum method. For areas in the lowlands and far from the coast but there are bodies of water such as lakes, swamps and rivers with slow flow, which are large enough, the potential of the water has not been used to drive electricity generation and the question arises whether it can be utilized to drive the converter. For this reason, it is necessary to research the use of calm water to drive the converter. By adopting the WEC technology used in ocean waves, the vertical pendulum method above the pontoon was chosen in this study, which according to the author's consideration is simpler than the other methods. The design of the converter made was a vertical pendulum mounted on a flat pontoon by adding components in the form of a barrier pair to make water surging continuously under the pontoon so that the pendulum swings continuously. In this study the observed variable was the power produced by the converter by varying the arm length from 0.2 to 0.3 m with a pendulum load varying from 0.5 to 1 kg. Theoretical analysis showed the results of greater mechanical power produced by using a larger pendulum mass. And the faster rotation of the pendulum shaft was produced by using the shorter pendulum arm.
STUDI EKSPERIMEN PENGARUH JUMLAH BLADE PENGADUK TERHADAP KUALITAS BIODIESEL YANG DIHASILKAN DARI MINYAK JELANTAH Drajat Indah Mawarni
SIMETRIS Vol 11 No 2 (2017): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

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Abstract

Biodiesel is an alternative material that is environmentally friendly, has no effect on health and can be used as fuel for motor vehicles. The raw material for making biodiesel uses raw cooking oil with KOH catalyst, the research conducted using the number of blades, namely 4 blades, 6 blades and 8 blades. The purpose of this study was to determine the effect of the number of blades on the quality of biodiesel which includes calorific value, viscosity, density, flash point, pour point produced from waste cooking oil. Variation in the number of 4 blades, 6 blades, and 8 blades with a stirring process for 1 hour at 100 rpm rotation. The results of research that have been done are variations in the number of blades affect the quality of biodiesel produced, this is evidenced that from the number of blades 8 produces a heating value of 17.46 46 Btu / lb. Making a difference between blade 8 with 6 yields a difference of 0.14 Btu / lb and blade 8 with 4 produces a difference of 0.28 Btu / lb
PENGARUH DENSITAS TERHADAP KECEPATAN PEMISAHAN BIODIESEL/GLISERIN drajat indah mawarni
SIMETRIS Vol 14 No 2 (2020): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v14i2.124

Abstract

Abstrak Kajian ini bertujuan untuk mengetahui tingkat kecepatan pemisahan (creaming velocity) antara dua fluida yang berfasa sama namun memiliki perbedaan densitas. Kajian ini dilakukan secara eksperimental dengan mengamati dan mengukur waktu pisah (settling time) pada tabung kaca dengan variasi diameter.Pengukuran waktu pisah dilakukan lima kali untuk setiap diameter tabung. Waktu pisah yang di peroleh digunakan sebagai dasar untuk menghitung diameter tetesan/droplet, konsentrasi tetesan, kecepatan pemisahan/creaming velocity dan Vstokes. Hasil perhitungan yang di peroleh diploting untuk membandingkan nilai konsentrasi tetesan (droplet consentration/Φ) terhadap kecepatan pemisahan (creaming velocity) pada campuran biodiesel/gliserin dan untuk mencari nilai Φc (fraksi volume fase biodiesel yang terdispersi rapat dalam gliserin/konsentrasi tetesan) dan k (konstanta pemisahan). Dari penelitian ini dapat disimpulkan bahwa semakin tinggi nilai konsentrasi tetesan (Φ) maka kecepatan pemisahannya (V cream) akan semakin berkurang dan dari persamaan Hunter bahwa V = Vstokes(1- )k.Φc , maka didapatkan nilai k dan Φc masing – masing adalah (5,1 ; 0,6 ; 1,2) dan (0,461 ; 0,9 ; 0,69) pada percobaan I, II, III dengan diameter tabung (1,3 ; 2,8 ; 3,9) cm.
KAJI EKSPERIMENTAL PENGARUH PUTARAN PENGADUKAN TERHADAP KUALITAS BIODIESEL YANG DIHASILKAN DARI MINYAK JELANTAH drajat indah mawarni
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.192

Abstract

Biodiesel is diesel engine fuel in the form of triglyceride compounds derived from biological resources in the form of vegetable fat oils and animal fats. Making this biodiesel using used cooking oil from food frying with KOH base catalyst and variations of stirring rotation 200, 300, 400 rpm. The transesterification reaction was initiated by heating used cooking oil with methanol and KOH catalyst at a temperature of 55C and various stirring cycles were carried out. The test was carried out at the Laboratory of Heat and Mass Transfer, Gajah Mada University, Yogyakarta. The purpose of this research is to make diesel engine fuel, to get the best stirring cycle used in the manufacture of biodiesel and to determine the quality of biodiesel, including Density Value, Viscosity, Calorific Value, Pour Point, Flash Point, Fog Point. Based on the tests carried out, it can be concluded that the best stirring rotation at 400 rpm is getting a Density Value of 891.9 kg/m3, a viscosity value of 5.2 cSt, and a 200 rpm getting the best Calorific Value 15.505 Btu/lb, a Pour Point Value of 12.33oC, a Cloud Point Value of 5.5 C and Flash Point Value 168.6oC
Kaji Eksperimental Variasi Bentuk Injektor Udara Terhadap Pola Aliran Dan Debit Air pada Air-Lift Pump Drajat Indah Mawarni
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.262

Abstract

Two-phase flow is two different fluid streams flowing in a pipe. Two-phase flows precipitate into gas-liquid, gas-solid, solid-liquid flows. Apart from the flowing fluid, two-phase flow is differentiated according to the direction of the vertical pipe and the direction of the horizontal pipe. The purpose of this study was to determine the pattern of flow and discharge in the air-lift pump through variations in the shape of the injector. This test was carried out with variations in the shape of the injector, namely the type of nozzle, tube and diffuser, using a test pipe with a vertical direction and a length of 500 mm with a diameter of 24 mm, using a water level of 450 mm with a superficial gas velocity of 0.07 m/s, 0.085 m/s , 0.10m/s. Of the injectors that have been carefully inspected, the nozzle-type injector with a superficial gas of 0.10 m/s produces the highest water discharge. While the lowest water discharge is found in the type of diffuser injector with superficial gas of 0.075 m/s. In observing the flow pattern of the injector nozzle the flow that occurs is (churn flow) but in each flow pattern there are several bubbles that appear. The flow patterns of tube injectors The flow patterns that occur are churn flow and annular flow. And in the diffuser injector, the flow pattern that occurs varies, namely churn flow and slug flow, the greater the superficial gas, the flow pattern changes to annular flow.
Studi Eksperimental Karakteristik Pressure Drop Aliran Dua Fase Air – Udara pada Elbowmiter Mawarni, Drajat Indah; Sutarto, Eko; Junaidi, Muksan
SIMETRIS Vol 17 No 1 (2023): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v17i1.333

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh belokan patah (elbow miter) tehadap pressure drop aliran dua fase. Penggunaan elbow pada sistem perpipaan sangat umum sekali karena untuk memenuhi kebutuhan desain dan geometri sistem perpipaan. Piranti uji menggunakan pipa acrylic dengan diameter dalam 32 mm pada posisi vertikal, disambung dengan elbow miter 45odan dilanjutkan dengan pipa dengan kemiringan 45o. Air dan udara digunakan sebagai fluida kerja. Pengujian dilakukan dengan variasi kecepatan superfisial cairan (USL) mulai 0,30-0,50 m/s dan kualitas volumetrik udara (β)= 0,06-0,22. Pola aliran didokumentasikan dengan kamera digital dan pengukuran pressure drop menggunakan manometer tipe-U. Hasil pola aliran dengan variasi range USL 0,30-0,50 m/s menunjukkan pola aliran bubble flow, seiring meningkatnya nilai USL konsentrasi bubble cenderung menempati inner elbow. Pressure drop aliran dua fase menurun seiring meningkatnya nilai β pada aliran hal tersebut dikarenakan menurunnya nilai massa jenis aliran. Pressure drop terendah terjadi pada USL 0,30 m/s dan β 0,22 yaitu sebesar 3628,591 N/m2, sedangkan nilai pressure drop tertinggi terjadi pada USL 0,50 m/s dan β 0,06 yaitu sebesar 3892,67 N/m2.
Co-Authors Agung Pambudi Ali Achmadi Arifiyanto Hadinegoro, Arifiyanto Bambang Supranoto Batubara, Yongki Berkah Fajar Tamtomo kiono Budhijanto , Wiratni Budhijanto Deendarlianto Deendarlianto , Deendarlianto Deendarlianto Deendarlianto Deendarlianto Deendarlianto Hakeem Niyas IGNB Catrawedarma Indarto , Indarto Indarto - Indarto Indarto Indarto Indarto Indarto Indarto JUNAIDI, MUKSAN Kahartoni, Kahartoni Korawan, Agus Dwi Kumara Ari Yuana Kumara Ari Yuana M. Slamet Riyadi Mai Salem Marahendra , Wawan Dedi Marahendra Mudjijanto Mudjijanto Ratna Dwi Rahayu Ristiyanto, Hartono Guntur Rosadila Febritasari Sarip Sarip Sarjono Sarjono suryani, puput eka Suryanto, Hendri Sutarto, Eko Teguh Wibowo Wibawa Endra Juwana Wiratni Budhijanto Wiratni Budhijanto Wiratni Budhijanto Yuana, Kumara Ari