Juan Andre

Biodata Diri

Nama: Juan Andre Mendaun Karapa

NPM: 2106728130

Hobi: Tidur

Saya adalah mahasiswa FTUI angkatan 2021 dari jurusan Teknik mesin dan saya adalah salah satu ciptaan terbaik dari Tuhan yang Maha Esa karena pada prinsipnya Tuhan yang Maha Esa itu mendesain manusia dengan sebaik baiknya makhluk.

Teknik Mesin merupakan program studi yang saya gemari dikarenakan ayah saya juga merupakan lulusan Teknik Mesin.

Tugas Kinematika 1

Mekanika fluida adalah cabang mekanika yang mempelajari mengenai pergerakan dari fluida. Pergerakan ini diamati dalam bentuk cairan maupun gas. Dalam mekanika fluida juga dipelajari fluida yang tidak dalam keadaan bergerak atau diam.

Tugas chatgpt,24 Februari 2023

Manometer basics.

Juan Andre

What do you know about manometer

A manometer is an instrument used to measure pressure, typically in a fluid, gas or vapor. It works by comparing the pressure of the substance being measured to a reference pressure, usually atmospheric pressure.

There are several types of manometers, including U-tube manometers, inclined-tube manometers, and digital manometers. U-tube manometers consist of a U-shaped tube partially filled with a liquid, typically mercury or water, and the pressure difference between the two ends of the tube is measured by the difference in the liquid levels. Inclined-tube manometers are similar to U-tube manometers, but the tube is inclined at an angle to make it easier to read the measurement. Digital manometers use electronic sensors to measure pressure and display the results digitally.

Manometers are used in a variety of applications, including monitoring pressure in HVAC systems, measuring blood pressure, and measuring the pressure in industrial processes. They are often used in combination with other instruments to provide a complete picture of a system's pressure and flow characteristics.

How it's work

A manometer works by measuring the difference in pressure between two points. One end of the manometer is connected to the substance whose pressure is to be measured, while the other end is open to the atmosphere or connected to a reference pressure. The pressure difference between the two ends causes a change in the level of a liquid column in the manometer.

For example, in a U-tube manometer, a liquid such as mercury or water is partially filled into a U-shaped tube. One end of the tube is open to the substance whose pressure is to be measured, while the other end is open to the atmosphere or connected to a reference pressure. The pressure difference between the two ends causes the liquid level in one arm of the U-tube to rise and the level in the other arm to fall. The difference in the liquid level can be measured and used to calculate the pressure difference.

The height difference in the liquid column is proportional to the difference in pressure between the two points. The pressure can be calculated using the equation:

pressure difference = density x gravity x height difference

where density is the density of the liquid, gravity is the acceleration due to gravity, and height difference is the difference in the height of the liquid column in the manometer.

Other types of manometers, such as digital manometers, use different mechanisms to measure pressure, such as electronic sensors or strain gauges, but they still rely on the principle of comparing the pressure of the substance being measured to a reference pressure.

Juan Andre

But can this manometer works underwater or in vacuum space

The performance of a manometer can be affected by various factors, such as the type of manometer, the properties of the fluid being measured, and the operating conditions.

In general, manometers can work underwater as long as the liquid used in the manometer has a specific gravity greater than that of water and is not affected by the underwater pressure. However, the design of the manometer may need to be adjusted to account for the underwater pressure, which can increase with depth.

In a vacuum space, manometers can still work but may need to be designed differently to operate properly. A traditional U-tube manometer that relies on gravity to move the fluid column may not work in a vacuum since there is no atmospheric pressure to balance the pressure of the fluid being measured. In this case, a different type of manometer, such as a digital manometer, may be needed that does not rely on a fluid column to measure pressure.

It's important to note that not all manometers are suitable for use in extreme conditions like underwater or in a vacuum space, and it's essential to select a manometer that is designed and calibrated for the specific operating conditions and requirements.

Tugas 1. Manometer analog

Pertanyaan

1. Jelaskan mekanisme kerja manometer analog

2. Jelaskan mekanisme kerja manometer tipe U (fluida air)

3. Tuliskan hasil pengukuran P1, P2, dan P2 (ketika menggunakan manometer tipe U)

4. Faktor apa yang mempengaruhi tinggi rendahnya tekanan

5. Tuliskan satuan yang ada pada manometer tersebut dan konversi ke dalam satuan SI

6. Buatlah skala tekanan pada manometer tersebut

Penyelesaian :

1. Manometer analog memanfaatkan cairan yang terkandung dalam tabung berbentuk U dan beroperasi menggunakan prinsip Keseimbangan Hidrostatik. Cairan di dalam tabung akan mengendap pada ketinggian yang sama di setiap kaki tabung ketika kedua ujungnya terbuka terhadap tekanan atmosfer.Alat pada Manometer analog ialah jarum yang akan bergerak sesuai dengan tingkat deformasi yang diakibatkan tekanan dari fluida yang diukur,mekanismenya memanfaatkan gerakan mekanis dan magnet yang dikombinasikan untuk mengukur tekanan di manometer

2. Tabung U diisi oleh fluida hingga di kedua sisi tabung sama tinggi. Kemudian ujung tabung satu terbuka dan dibiarkan mengalami tekanan lingkungan. Sedangkan ujung satunya dihubungkan ke selang yang mengalirkan sample fluida (udara) bertekanan. Akan terjadi perbedaan ketinggian pada sisi tabung yang mengalami tekanan lingkungan dan yang mengalami tekanan sample fluida yang diukur.

Aliran akan dipompa oleh vacuum pump akan melewati beberapa katup

3. Di manometer analog

Di manometer U, h1=0.2 cm, h2=0.85 cm, h3= 1.15 cm, fluida = air, g = 9.81m/s^2

Percobaan 1 (katup 2 tertutup)

P1 = 10 mbar, P2 = 1.5 mbar

Percobaan 2 (katup 2 terbuka sebanyak 2 putaran keran)

P1 = 8.5 mbar, P2 = 1.25 mbar

Tekanan udara pada percobaan pertama,

P(gas) = ρ(udara) + ρ(air) . g . (h2 - h1)

P(gas) = 101325 N/m^2 + 1000 kg/m^3 . 9.81 m/s^2 . 0.0065 m

P(gas) = 101388 N/m^2 = 101388 Pa

Tekanan udara pada percobaan kedua,

P(gas) = P(udara) + ρ(air) . g . (h3 - h1)

P(gas) = 101325 N/m^2 + 1000 kg/m^3 . 9.81 m/s^2 . 0.0095 m

P(gas) = 101418 N/m^2 = 101418

4. Densitas (kepadatan) dari fluida yang dimasukkan kedalam manometer.

5. pada manometer = mbar

Satuan Internasional (SI) untuk tekanan = Pascal (Pa)

1 mbar = 100 Pa

6. Skala Tekanan: 1 milibar=100 Pa

chat dengan AI Jumat, 24 Februari 2023

Juan Andre Hallo

Hello! How can I assist you today?

Juan Andre Can you solve my homework?

I'll do my best to assist you with your homework! Please provide me with more details about the specific problem or task you need help with.

Juan Andre So i need you to calculate pressure at the hull of submarine which sink at 30 feet deep underwater

Sure, I can help with that.

The pressure at a certain depth in water is determined by the weight of the water above that depth. This is given by the formula:

Pressure = Density x Gravity x Depth

where:

Density is the density of the fluid (in this case, water) Gravity is the acceleration due to gravity Depth is the depth below the surface of the water Assuming the density of water is 1000 kg/m^3 and gravity is 9.81 m/s^2, we can calculate the pressure at a depth of 30 feet as follows:

Convert feet to meters: 30 feet = 9.144 meters

Plug in the values into the formula: Pressure = Density x Gravity x Depth Pressure = 1000 kg/m^3 x 9.81 m/s^2 x 9.144 m Pressure = 88,029.84 Pascal (Pa)

Therefore, the pressure at the hull of the submarine at a depth of 30 feet underwater is approximately 88,029.84 Pa.

Juan Andre Oh ok another question

Sure, what's your next question?

Juan Andre Find the height difference between the free water surface and free oil surfaces,given the oil difference with water surface is 20cm

To find the height difference between the free water surface and free oil surface, we can use the principle of fluid statics, which states that the pressure at any given point in a static fluid is the same in all directions.

Let's assume that the densities of oil and water are ρ_oil and ρ_water, respectively, and that the height difference between the oil and water surfaces is h_oil-water.

We can use the equation for pressure at a depth in a fluid to relate the pressures at the oil and water surfaces:

P_water + ρ_water * g * h_oil-water = P_oil

where P_water and P_oil are the pressures at the free surfaces of water and oil, respectively, and g is the acceleration due to gravity.

Since the pressure at both free surfaces is atmospheric pressure, we can assume that P_water = P_oil = P_atm.

Substituting this into the equation and rearranging, we get:

h_oil-water = (P_atm / (ρ_oil * g)) - (P_atm / (ρ_water * g))

h_oil-water = P_atm * (1 / (ρ_oil * g) - 1 / (ρ_water * g))

Given that the oil/water height difference is 20 cm, or 0.2 m, we can plug in the values for atmospheric pressure, the densities of oil and water, and acceleration due to gravity to find the height difference between the free water surface and free oil surface:

h_oil-water = (101325 Pa) * (1 / (860 kg/m^3 * 9.81 m/s^2) - 1 / (1000 kg/m^3 * 9.81 m/s^2))

h_oil-water = 3.188 x 10^-3 m, or approximately 3.19 mm

Therefore, the height difference between the free water surface and free oil surface is approximately 3.19 mm.

Tugas Praktikum,4 November

Tugas dal bentuk dokumen yang berisikan: 1. Prinsip kerja alat pengukur tekanan (manometer analog, manometer U, pressure tranducerr) 2. Studi kasus manometer U dengan tekanan 300 Pa maka akan menyebabkan peningkatan tekanan h ...untuk masing2 fluida air, raksa, minyak. 3. Chat GPT seputar eksperimen hari ini.

Contoh dari alat pengukur tekanan adalah

(1)

1. Manometer analog,

2. Manometer tipe U, dan

3. Pressure sensor.

Manometer analog bekerja dengan prinsip menggerakkan jarum sesuai dengan besaran tekanan yang diukurnya.

Dalam sebuah manometer analog, terdapat sebuah fluida yang terjebak di bagian bawah tabung manometer, dan ketika terdapat udara berkecepatan tertentu maka udara tersebut akan mendorong fluida di dalam tabung manometer sehingga air di tabung manometer naik dan mendorong jarum manometer sejauh angka tekanan yang diindikasikan (diukur) oleh manometer tersebut.

Pencatatan data pengukuran dilakukan secara manual dengan melihat arah jarum manometer analog tersebut.

Manometer tipe U mengandalkan perhitungan menggunakan persamaan

P(gas) = P(udara bebas) + ρ.g.Δh

P(gas) - P(udara bebas) = ρ.g.Δh

ΔP = ρ.g.Δh

dimana hasil pengukuran perbedaan tekanan bergantung pada jenis fluida yang digunakan, percepatan gravitasi, dan perbedaan ketinggian fluida.

Pressure sensor memanfaatkan prinsip data acquisition, dimana tekanan yang diukur dicatat dalam bentuk data secara online atau real-time melalui sebuah program dan menyimpan data tersebut di perangkat komputer.

Selain macam-macam alat pengukur tekanan, kami juga mempelajari sistem penyaluran udara yang digunakan dan diperagakan Kakak pengajar di lab CCIT kukusan. Jika kita meletakkan alat pengukur di dekat alat peniup udara, tekanan yang diukur semakin besar, dan jika posisi pengukuran dilakukan di ujung sistem saluran udara (dekat ujung pipa yang berhubungan dengan udara bebas), maka pengukuran tekanan yang didapatkan sangat kecil (mendekati nol).

Hasil pengukuran yang mendekati nol disebabkan karena ujung saluran udara yang terhubung ke udara bebas terdapat tekanan udara bebas yang berusaha menekan masuk ke dalam pipa. Maka semakin dekat posisi pengukuran dengan udara bebas dibandingkan dengan posisi peniup udara, maka semakin kecil perbedaan tekanan yang diukur.

Alat pengukur tekanan dapat mengalami error atau kerusakan sehingga menyebabkan kesalahan pengukuran. Alat pengukuran yang rusak tersebut dapat diperbaiki dengan cara dikalibrasi (diperbaiki sesuai error yang dihasilkan alat tersebut), dan diverifikasi (memastikan bahwa seluruh hasil pengukurannya sudah sesuai standar).

Masing-masing alat ukur memiliki akurasi yang berbeda. Contohnya manometer analog memiliki skala terkecil sebesar 1.25 mbar, lalu pressure transducer memiliki skala yang detail dan range yang cukup besar (~ 0-10 Bar), dan manometer tabung U memiliki skala terkecil pengukuran sebesar 1000 . 9,81 . 0.001 = 9.81 Pa = 0.0981 mbar

(2) Soal perhitungan.

Pada percobaan pengukuran tekanan menggunakan manometer analog, didapatkan nilai tekanan sebesar 3 mbar.

Jika percobaan dilakukan pada manometer tabung U dengan percepatan gravitasi dimisalkan 10m/s^2, hitunglah perbedaan ketinggian yang dihasilkan

(a). Jika fluida yang digunakan adalah minyak dan raksa.

(b). Menggunakan fluida yang disebutkan pada poin (a), tetapi dengan tekanan 30 mbar (sesuai perhitungan maksimum perbedaan tekanan menggunakan penggaris/apabila fluidanya naik 30 cm).

Jawab

(a). Jika fluida nya adalah minyak

3mbar = 800 kg/m^3 . 10 m/s^2 . Δh

300 Pascal = 800 kg/m^3 . 10 m/s^2 . Δh

Δh = 0.0375 m

Jika fluida nya adalah raksa

3mbar = 13600 kg/m^3 . 10 m/s^2 . Δh

300 Pascal = 13600 kg/m^3 . 10 m/s^2 . Δh

Δh = 0.0022 m

(b). Jika fluida nya adalah minyak

30mbar = 800 kg/m^3 . 10 m/s^2 . Δh

3000 Pascal = 800 kg/m^3 . 10 m/s^2 . Δh

Δh = 0.375 m

Jika fluida nya adalah raksa

30mbar = 13600 kg/m^3 . 10 m/s^2 . Δh

3000 Pascal = 13600 kg/m^3 . 10 m/s^2 . Δh

Δh = 0.022 m