Aspirator atau radas sedot[1] merupakan suatu jenis pompa jet-ejektor, yang menghasilkan vakum dengan memanfaatkan efek Venturi.
Dalam aspirator, fluida (cairan atau gas) mengalir melalui tabung pertama yang menyempit dan kemudian melebar di area penampang. Saat tabung menyempit, tekanan fluida berkurang. Di daerah sempit ini kecepatan fluida harus meningkat untuk menjaga kontinuitas massa. Di tempat di mana tabung menyempit, vakum ditarik akibat efek Venturi.[2]
Aspirator air yang sederhana dan murah merupakan jenis aspirator yang paling umum. Alat ini digunakan dalam laboratorium kimia dan biologi dan terdiri dari fiting tee yang menempel pada suatu keran dan memiliki lubang selang pada salah satu sisinya. Aliran air melewati bagian lurus tee, yang memiliki batasan di persimpangan, di mana selang dilekatkan. Selang vakum harus dihubungkan dengan lubang ini. Di masa lalu, aspirator air umum terdapat pada vakum dengan kekuatan rendah di meja kerja kimia. Namun, airnya sangat padat, dan tergantung pada apa vakum digunakan untuk (yaitu pelepasan pelarut), mereka dapat melanggar undang-undang perlindungan lingkungan seperti RCRA dengan mencampur bahan kimia yang berpotensi berbahaya ke dalam aliran air, kemudian menyiramnya ke saluran pembuangan yang sering mengarah langsung ke saluran pembuangan kota.
Jika cairan digunakan sebagai fluida kerja, kekuatan vakum yang dihasilkan dibatasi oleh tekanan uap cairan (untuk air, 32 kPa or 4,6 psi atau 32 mbar pada 25 °C or 77 °F). Jika suatu gas digunakan, tetapi, pembatasan ini tidak terjadi. Ejektor uap industri (disebut pula "ejektor jet uap", "aspirator uap", atau "aspirator jet uap") menggunakan uap sebagai fluida kerja.[3]
Untuk menghindari penggunaan uap yang berlebihan, suatu tahapan tunggal ejektor uap umumnya tidak digunakan untuk menghasilkan vakum dibawah sekira 10 kPa (75 mmHg).[4] Untuk menghasilkan vakum yang lebih tinggi, banyak tahapan digunakan; dalam suatu ejektor uap dua-tahap, misalnya, tahapan kedua menyediakan vakum untuk keluaran uap buangan melalui tahap pertama. Pendingin mungkin digunakan diantara tahapan-tahapan tersebut untuk mengurangi beban pada tahap berikutnya. Ejektor uap dengan dua, tiga, empat, lima dan enam tahapan mungkin digunakan untuk menghasilkan vakum hingga 2.5 kPa, 300 Pa, 40 Pa, 4 Pa, dan 0.4 Pa, berturut-turut.[4]
Ejektor udara atau pompa Venturi serupa dengan ejektor uap namun menggunakan udara bertekanan-tinggi sebagai fluida kerja. Mereka disebut sebagai Ejektor Vakum[5] dan menghasilkan vakum dengan mengubah telanan pada udara terkompresi. Ejektor udara banyak-tahap dapat digunakan, tetapi karena udara tidak dapat dengan mudah terkondensasi pada suhu ruangan, suatu ejektor udara biasanya dibatasi hingga dua tahapan saja.[6]
SmaulmyrarNaturreservatLandSverigeKommunRegion GotlandArea63,36 hektar[1]Inrättat20 november 2019[1]Läge Smaulmyrar SmaulmyrarUtsträckning Områdets utsträckning.Koordinat57°21′24″N 18°37′30″Ö / 57.356651774641°N 18.62512284348°Ö / 57.356651774641; 18.62512284348Koder, länkar, kartorIUCN-kategoriIUCN-kategori Ia: Strikt naturreservat[1]NVR-id2052182[1] (karta)WDPA-id555639125 (karta)FörvaltareLänsstyrelsen i Gotlands länRedigera Wikidata Smaulmyrar
Canadian ice hockey player (1937–2020) Ice hockey player Eddie Shack Shack with the Toronto Maple Leafs in the 1960sBorn (1937-02-11)February 11, 1937Sudbury, Ontario, CanadaDied July 25, 2020(2020-07-25) (aged 83)Toronto, Ontario, CanadaHeight 6 ft 1 in (185 cm)Weight 200 lb (91 kg; 14 st 4 lb)Position Left wingShot LeftPlayed for New York RangersToronto Maple LeafsBoston BruinsLos Angeles KingsBuffalo SabresPittsburgh PenguinsPlaying career 1957–…
Townshend Dam and Lake Following is a list of dams and reservoirs in Vermont. All major dams are linked below. The National Inventory of Dams defines any major dam as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m3), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m3).[1] Dams and reservoirs in Vermont North Hartland Lake This list is incomplete. You can help Wikipedia by expanding it. Ascutney Mill Dam, …
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American engineer This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (November 2022) (Learn how and when to remove this template message) Gridley BryantBornAugust 26, 1789Scituate, MassachusettsDied(1867-06-13)June 13, 1867Scituate, Massachusetts Gridley Bryant Gridley Bryant (1789 – June 13, 1867) was an American construction engineer who ended up building the fi…
هذه المقالة يتيمة إذ تصل إليها مقالات أخرى قليلة جدًا. فضلًا، ساعد بإضافة وصلة إليها في مقالات متعلقة بها. (نوفمبر 2023) اتحاد القوى الشعبية العاملة – الحركة التصحيحية التأسيس تاريخ التأسيس أكتوبر 1974م المؤسسون عصام العرب (1974–1978)حسن القبيسي (1978–?) القادة حيدر العبادي عدد الأعض
This article needs to be updated. Please help update this article to reflect recent events or newly available information. Last update: 7 November 2016 (June 2020) NicaraguaFIBA zoneFIBA AmericasWorld ChampionshipsAppearancesNoneAmericas ChampionshipsAppearancesNone The Nicaragua women's national under-17 basketball team is a national basketball team of Nicaragua, managed by the Federación Nicaraguense de Baloncesto.[1] It represents the country in international under-16 and under-17 (u…
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1967 Pakistani filmNawab Sirajuddaulaনবাব সিরাজউদ্দৌল্লাDirected byKhan Ataur RahmanStarringAnwar HossainCinematographyBaby IslamMusic byKhan Ataur RahmanRelease date12 January 1967CountryPakistanLanguageBengali Nawab Sirajuddaula is a 1967 Bengali language Pakistani biographical film which details the life of Nawab of Bengal Siraj ud-Daulah (1733–1757) and the Battle of Plassey (1757).[1] Khan Ataur Rahman was the director and screenwriter of the fi…
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