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PENGARUH JUMLAH DAN KEMIRINGAN SUDU MIXER POROS VERTIKAL (VERTICAL STIRRED MIXER) TERHADAP UNJUK KERJA PENCAMPURAN
Get PDFMixing process use to mix liquid, viscous and granular materials. One of the common mixing devices is a vertical stirred mixer which uses a tank and a vertical shaft that rotate mixing blades. This research is done to get the effect of the blade’s number and angle inclination due to mixing performance. Mixing performance is defined as stretching and folding. The research is done by experiment. The blade’s number varies as 2, 3 and 4 blades. Blade’s inclination is varied as 90o, 80o, 70o and 60o. The blades are rotated 10 rpm. A cylinder with 18 cm diameter and 12 cm height use as mixing tank. White wall paint is used as mixing material. Black wall paint uses a tracker. Mixing processes are observed by a camera on top of the mixer. The mixing processes are arranged for 2 mixer shaft rotations. Video data are captured frame by frame and analyzed using image software. The result shows that blade’s number and angle inclination have an effect due to mixing performance. Blade’s number tends to decrease stretching and folding. Blade’s angle inclination also tends to decrease stretching and folding.
Keywords: vertical stirred mixer, blade's inclination, stretching, foldin
PENGARUH KONSENTRASI EKSTRAK KULIT BUAH MAJA TERHADAP LAJU KOROSI BAJA KARBON A53 DENGAN MEDIA AIR LAUT
Get PDFCorrosion is damage or degradation of the metal due to a redox reaction between a metal with a variety of substances in the environment that produce compounds that are not desired. Corrosion is a chemical phenomenon that occurs on metallic materials in a wide range of environmental conditions. Research on the use of tannin as a reaction inhibitor of steel corrosion in a salt solution has been carried out. One of the natural substances containing the compound tannin is maja fruit. Many contain tannins in the skin maja fruit can be used to inhibit the corrosion reaction baja. This study aims to determine the effect of the corrosion rate in carbon steel A53 in a solution of sea water with a variety of fruit skin extracts maja. Variabel used are varied concentration maja fruit skin extracts with a percentage of 0%, 0.1%, 0.2%, 0.3%, and 0 , 4%. While the parameters measured were weight loss. Corrosion rate of carbon steel A53 average at concentrations of 0% is 1.7041 mdd, 0.1% is 0.4674 mdd, 0.2% is 0.4488 mdd, 0.3% is 0.3921 mdd, and 0.4% is 0.3356 mdd. The average efficiency inhibitor maja fruit skin extracts after soaking for 45 days was 75.88% and the most effective immersion occurs on a day to 35 days amounted to 76.12%
MODIFIKASI KURSI PENUMPANG KERETA API EKONOMI YANG ERGONOMIS DENGAN METODE ERGONOMIC FUNCTION DEPLOYMENT (STUDI KASUS PADA KA LOGAWA YANG DIPRODUKSI DI PT. INKA)
Get PDFEconomic train is one of transportations that is often used by Indonesian people because it has an economical cost and a wide extent. However, economic passenger seat that exists so far is still inappropriate according to anthropometry’s user. In the process of designing, it is necessary to pay attention toward the ergonomic aspect together with anthropometry approach in order to produce seat design which is suitable with the passenger’s expectation and body size. The purpose of this study is to get an ergonomic passenger seat design and to get the appropriate seat based on Indonesian’s anthropometry. The process of this study consists of distributing questionnaire and measuring the anthropometry train user, then the result of the data is by making House of Quality EFD. The data showed a specification seat : high chair 390 mm, seat depth 400 mm, width of seats one passenger 400 mm, high backrest 840 mm, the angle backrest 1050 1150, wide backrest 430 mm, high armrest 190 mm, length of the armrest 300 mm, width of the footrest 42 mm, given a pouch / bag, the thickness of the cushion 100 mm, material cushion is polyurethane foam that material cover is polyvinyl chloride, color seats gray, seat position is not face to face, and material frame from stainless steel. The result of redesign of the train passenger seat might support the sitting posture of passenger in order to make them stay healthy and ideal, and the passenger seat might have more good appearance
INVESTIGASI NUMERIK VIV (VORTEX INDUCED VIBRATION) PADA DIAMETER KABEL HYDROPHONE 0.04 M SISTEM AKUSTIK BAWAH AIR
Get PDFThe 2D numerical simulation of an underwater acoustic system undergoing VIV (Vortex Induced Vibration) which is in position parallel to 5 m distance with variation of hydrophone cable position. The diameter of the hydrophone cable in use is 0.04 m, with Reynold numbers (Re) variations of 13000, 15000, 17000, 19000, 21000, 23000, 25000, 27000 and 30000. Position variations are used to determine the flow pattern characteristics that occur behind the cylinder as well the maximum value of drag coefficient (CD) and lift coefficient (CL). The simulation results show that the characteristic flow pattern around a cylinder at each Re value indicates the release of the vortex behind the cylinder with different drag and lift coefficient values.
Keywords: Vortex Shedding, Hydrophone, Acoustic Syste
ANALISIS VARIASI TIPE EVAPORATOR DENGAN REFRIGERAN LPG TERHADAP UNJUK KERJA MESIN REFRIGERATOR
Get PDFRefrigeration system is a system working for cooling temperature some goods or room with absorbs the heat. Refrigeration process is very important for store a food and beverage so will be able to keeep up in certain time, refrigerator development has achieve characteristic improvement about non-ODP (Ozone Depleting Potential) and non-GWP (Global Warming Potential) refrigerant as well as alternative refrigerant until now. The purpose of this research is to know about effect from variation evaporator type using LPG refrigerant againts refrigerator performance. Experimental methode did for the direct test to analyzed how much effect from variation evaporator type that are used in (serries one space, ser series two space, parallel one space, and parallel two space) useing C plate evaporator and compressor ¾ pk . This research are do it by installing an evaporator in each unit of refrigerator chamber top part and refrigerator chamber bottom part that arranged by series and parallel which is in each chamber have a breaker or without breaker. The result from the research variation of evaporator type for refrigerator is to know how much  the effect of refrigeration, compression working, refrigeration capacity, and Coefficient Of Performance (COP). The lowest temperature is shown from evaporator type series one space, that have a value -21,2 OC. The lowest interval from both of chamber type is shown from evaporator type parallel two space, that have a value 3,64 OC. Coefficient Of Performance (COP) from series type is 9,06 for one space and 9,01 for two space, then from parallel type is 10,59 for one space and 13,43 for two space. Based from research the acquired result that is from using evaporator series type and parallel type is could be used for cooling down several room in refrigerator
KARAKTERISTIK API SYNGAS PADA GASIFIKASI DOWNDRAFT DENGAN BAHAN BIOMASSA SEKAM PADI
Get PDFTelah dilakukan penelitian tentang karakteristik api pada gasifikasi dengan  reaktor tipe downdraft menggunakan biomassa  sekam padi. Penelitian ini  menggunakan variasi air fuel ratio (AFR) sebesar 1.08, 1.35, 1.62, 1.90 untuk mengetahui temperatur dan warna api. Hasil dari penelitian menunjukkan bahwa kualitas syngas yang baik ditunjukkan dengan api yang bewarna biru. Proses gasifikasi  optimal pada suplai udara sebesar 1,0 m/s yang ditunjukkan oleh cepatnya api mencapai warna biru 100 % dan temperatur api tertinggi mencapai 675°C . Semakin jauh dari nilai AFR optimal, kualitas syngas akan semakin menurun yang ditunjukkan oleh menurunnya temperatur api dan prosentase warna api biru. Temperatur dan warna api bisa digunakan sebagai parameter yang menunjukkan kualitas syngas
PENGARUH UKURAN PARTIKEL LIMBAH KOPI TERHADAP KARAKTERISASI SIFAT MEKANIK PADA PANEL KOMPOSIT
Get PDFPanel composite materials using filler coffee waste particles with various particle sizes have been analyzed for effect. The matrix used is 2504APT eterset polyester resin, and the method used in making composites is the vacuum method. Particle size variations used are using mesh sizes 30, 40, 50, 60, and 70. Mechanical strengths such as tensile strength and bending strength are compared and evaluated. Interface analysis was also carried out by using a micro-test to determine the microstructure of the test specimens. The tensile strength obtained by the most significant value on the 50 mesh is 24.89 MPa, while the highest bending strength value is in the 60 mesh of 50.9 MPa. The addition of coffee waste particles with various sizes influences the mechanical properties of the coffee waste composite panel.
Keywords: panel composites, coffee waste particles, particle size, mechanical properties, microstructur
ANALISIS PENAMBAHAN SERAT JERAMI TERHADAP KARAKTERISTIK KUAT TARIK KOMPOSIT FRP (FIBER REINFORCEMENT PLASTIC)
Get PDFThis aims of this research is to determine the mechanical characteristics of composite materials from one of organic fibers that have environmentally friendly properties and widely available in the territory of Indonesia. The organic fiber studied in this research was rice straw, the characteristics to be studied were tensile strength by tensile testing and adjusted to ASTM standard (American Standards of Test Materials). The composite / composite paneling is made by hand lay up and with manual emphasis using glass as a mold and press. Composition of the test material (composite) ie the volume of rice straw by 35%, 64.5% resin volume and 0.5% catalyst volume. The variables of this study are the length of fiber 15 mm, 20 mm and 25 mmm, the direction of fiber angle 00 ,450 and 900 . Another variable is the length of soaking fiber with alkali. Based on the mechanical characteristics of organic fibers, it is obtained that the rice straw fiber which has the best tensile strength characteristic is by the immersion treatment among other variations.
Keywords: composite, rice straw, FR
ANALISIS PENGARUH SERAT LIMBAH TEFLON TERHADAP SIFAT MEKANIK KOMPOSIT FIBER SEBAGAI MATERIAL PENGGANTI ALAS COR BETON
Get PDFTeflon wastes are slightly difficult to recycle because the recycle products have different characteristic. Teflon wastes in flake form can used as alternative composite material. This research is aimed to get the effect of teflon waste due to mechanical properties of fiber composite. The research is done with laboratory experiments. Three different kind of Teflon which are white, blue and grey are studied. Teflon fiber compositions are varied as 0, 50, 70 and 90% of composite volume. The fibers are varied in length as 2, 3 and 4 cm, with 1 mm in width and thickness. Tensile tests are conducted for specimens with ASTM D-4762 standard. Charpy impact tests are conduct for specimens with with ASTM E 23 standard. The crack of the specimens are visualized with a digital camera. The result shows that Teflon fiber has effect due to mechanical properties. White Teflon tend to have greater tensile and impact strength rather grey and blue Teflon. The increase of Teflon composite volume tends to increase tensile and impact strength. Teflon length also tends to increase tensile and impact strength.
Keywords: teflon, waste, composite, mechanical propertie
PENGARUH VARIASI UKURAN PARTIKEL KOPI TERHADAP NILAI KONDUKTIVITAS TERMAL KOMPOSIT DENGAN MATRIK POLYESTER ETERSET 2504 APT
Get PDFHeat transfer is a science to determine heat transfer occurs in certain conditions due to temperature differences. The thermal conductivity is the nature of the form termofisik transport properties for heat transfer. Thermal conductivity value indicates how quickly heat mangalir in that particular material and understand the phenomena that occur in the conduction heat transfer. In this study focused on the value of the thermal conductivity of composite particles robusta coffee with a variety of mesh sizes 20, 40, 60, 80 and 100. The method of making composite using hand lay up. Variables used include variations in particle size coffee mesh 20, 40, 60, 80 and 100. The tests performed by the method of thermal conductivity in the composite particles of coffee. Data collection was performed by the method of observation for 60 minutes. From the research results minimum composite thermal conductivity values on the particle size of coffee that passes sieve mesh 20 that is equal to 0.006 W / máµ’C, composite thermal conductivity values optimum particle size of the coffee that passes sieve mesh 60 that is equal to 0.013 W / máµ’C. While the value of thermal conductivity composites in the coffee particle size that passes a sieve mesh of 100 decrease in the amount of 0.008 W / máµ’C. From the data analysis, it can be concluded that the smaller the particle size of the coffee, the thermal conductivity decreases indicating increased ability to inhibit heat conduction