Hutajulu, Gideon Quinn and Dr. Eng. Lilis Yuliati, ST., MT. and Dr. Eng. Nurkholis Hamidi, ST., M.Eng. (2022) Pengaruh Penambahan Etanol Terhadap Flame Spread dan Karakteristik Pembakaran Droplet Metil Laurat. Sarjana thesis, Universitas Brawijaya.
Abstract
Salah satu jenis FAME yang terdapat pada minyak nabati adalah metil laurat. Tetapi metil laurat sendiri memiliki beberapa kekurangan yaitu memiliki nilai ignition delay yang tinggi dan heating value yang rendah. Oleh karena itu perlu ditambahkan suatu zat untuk memperbaiki sifat tersebut. Salah satu zat yang dapat digunakan adalah etanol dikarenakan etanol memiliki titik didih yang relatif lebih rendah dibandingkan dengan metil laurat. Selain itu etanol dipilih karena etanol relatif mudah untuk didapatkan. Pada penelitian ini menggunakan metode penelitian eksperimental untuk mengetahui pengaruh penambahan etanol terhadap karakteristik-karakteristik pembakaran droplet metil laurat seperti ignition delay time, flame spread velocity, evolusi tinggi api, evolusi diameter droplet, temperatur droplet, mode persebaran api, dan burning rate constant. Untuk metode penelitian ini dilakukan dengan membuat tiga droplet yang diletakkan sejajar satu sama lain dengan menggunakan microsyringe agar ukuran droplet dapat sama setiap parameter. Salah satu droplet diletakkan pada termokopel untuk membaca temperatur droplet tersebut. jarak antara droplet yang ada pada termokopel awalnya dibuat dengan jarak 1,5 mm dan kedua droplet yang ada disampingnya dijaga pada jarak konstan yaitu sebesar 2,5 mm. Setelah merangkai susunan droplet, salah satu droplet kemudian dibakar dengan mendekatkan heater ke arah droplet tersebut. temperatur heater dijaga konstan pada temperatur 800°C. Kemudian setelah droplet terbakar heater akan ditarik ke posisi semula. Setelah data didapatkan maka jarak antara droplet pada termokopel dijauhkan dari droplet disebelahnya sejauh 0,5 mm. hal ini dilakukan berulang ulang sampai kenaikan temperatur tidak terbaca oleh termokopel. Hasil dari penelitian ini didapatkan dengan penambahan etanol maka ignition delay time metil laurat akan menurun dan flame spread velocity akan meningkat dikarenakan etanol mempunyai boiling point dan ignition point temperature yang lebih rendah sehingga droplet lebih mudah untuk terbakar dan api lebih mudah untuk menyebar. Selain itu pada batas persebaran api menjadi lebih tinggi dibandingkan dengan metil laurat murni. Hal ini terjadi karena droplet menjadi lebih mudah terbakar dan membuat fenomena microexplosion terjadi yang dapat membantu persebaran api. Evolusi diameter droplet yang ditambahkan etanol mengalami fluktuasi ketika droplet terbakar, hal ini disebabkan oleh perbedaan titik didih dari campuran yang menyebabkan fenomena microexplosion. Tinggi api pada droplet yang diambahkan etanol relatif lebih rendah yang disebabkan oleh konsentrasi oksigen dalam etanol tinggi dan akan memenuhi kebutuhan oksigen yang dibutuhkan untuk api dapat terbakar.
English Abstract
One type of FAME found in vegetable oil is methyl laurate. However, methyl laurate itself has several drawbacks, namely it has a high ignition delay value and a low heating value. Therefore it is necessary to add a substance to improve these properties. One of the substances that can be used is ethanol because ethanol has a relatively lower boiling point than methyl laurate. In addition, ethanol was chosen because ethanol is relatively easy to obtain. In this study, experimental research methods were used to determine the effect of adding ethanol to the combustion characteristics of methyl laurate droplets such as ignition delay time, flame spread velocity flame height evolution, droplet diameter evolution, droplet temperature, flame distribution mode, and burning rate constant. For this research method, it is done by making three droplets that are placed parallel to each other by using a microsyringe so that the droplet size can be the same for each parameter. One droplet is placed on a thermocouple to read the droplet temperature. The distance between the droplets in the thermocouple was initially made with a distance of 1.5 mm and the two droplets beside it were kept at a constant distance of 2.5 mm. After assembling the droplet arrangement, one of the droplets is then burned by bringing the heater closer to the droplet. heater temperature is kept constant at 800°C. Then after the droplet burns, the heater will be pulled back to its original position. After the data is obtained, the distance between the droplets on the thermocouple is kept away from the droplets next to it as far as 0.5 mm. This is done repeatedly until the temperature rise is not read by the thermocouple. The results of this study were obtained with the addition of ethanol, the ignition delay time of methyl laurate will decrease and the flame spread velocity will increase because ethanol has a lower boiling point and ignition point temperature so that droplets are easier to burn and fire is easier to spread. In addition, at the limit of the spread of fire to be higher than pure methyl laurate. This happens because the droplets become more flammable and create a microexplosion phenomenon that can help spread the fire. The evolution of the droplet diameter added with ethanol fluctuated when the droplets burned, this was caused by differences in the boiling points of the mixture which caused the microexplosion phenomenon. The flame height of the droplets added with ethanol is relatively lower due to the high oxygen concentration in ethanol and will meet the oxygen requirements needed for the fire to burn.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 0522070317 |
| Uncontrolled Keywords: | One type of FAME found in vegetable oil is methyl laurate. However, methyl laurate itself has several drawbacks, namely it has a high ignition delay value and a low heating value. Therefore it is necessary to add a substance to improve these properties. One of the substances that can be used is ethanol because ethanol has a relatively lower boiling point than methyl laurate. In addition, ethanol was chosen because ethanol is relatively easy to obtain. In this study, experimental research methods were used to determine the effect of adding ethanol to the combustion characteristics of methyl laurate droplets such as ignition delay time, flame spread velocity flame height evolution, droplet diameter evolution, droplet temperature, flame distribution mode, and burning rate constant. For this research method, it is done by making three droplets that are placed parallel to each other by using a microsyringe so that the droplet size can be the same for each parameter. One droplet is placed on a thermocouple to read the droplet temperature. The distance between the droplets in the thermocouple was initially made with a distance of 1.5 mm and the two droplets beside it were kept at a constant distance of 2.5 mm. After assembling the droplet arrangement, one of the droplets is then burned by bringing the heater closer to the droplet. heater temperature is kept constant at 800°C. Then after the droplet burns, the heater will be pulled back to its original position. After the data is obtained, the distance between the droplets on the thermocouple is kept away from the droplets next to it as far as 0.5 mm. This is done repeatedly until the temperature rise is not read by the thermocouple. The results of this study were obtained with the addition of ethanol, the ignition delay time of methyl laurate will decrease and the flame spread velocity will increase because ethanol has a lower boiling point and ignition point temperature so that droplets are easier to burn and fire is easier to spread. In addition, at the limit of the spread of fire to be higher than pure methyl laurate. This happens because the droplets become more flammable and create a microexplosion phenomenon that can help spread the fire. The evolution of the droplet diameter added with ethanol fluctuated when the droplets burned, this was caused by differences in the boiling points of the mixture which caused the microexplosion phenomenon. The flame height of the droplets added with ethanol is relatively lower due to the high oxygen concentration in ethanol and will meet the oxygen requirements needed for the fire to burn. .- Methyl laurate, Ethanol, Droplets, Spread of fire, Combustion |
| Subjects: | 600 Technology (Applied sciences) > 621 Applied physics > 621.8 Machine engineering |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | Endang Susworini |
| Date Deposited: | 05 Apr 2023 02:57 |
| Last Modified: | 05 Apr 2023 02:57 |
| URI: | http://repository.ub.ac.id/id/eprint/197987 |
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