Hose Definition and 85 Threads

I am using some solved excercises to put homework to my students but I cannot understand the proposed solution for c) a) $$ Q= 400 l/min = 6.67 ·10^3 m^3/s $$ applying continuity equation: $$ Q = S_1 v_1 \Rightarrow v_1 = \frac Q S_1 = 4.19 m/s $$ This is exactly the same as the proposed...

Don't reply too quickly, I've seen a lot of answers on this question already (differing ones of course, what would you expect), at first sight it would seem to be really simple but there are quite a few complicating factors. So the question is basically: what's the quickest way to fill up a...

Hello, Did a simple study at work recently and was confounded by the results. Hoping for a simple explanation…. Consider a pipe is inserted into a hose and a clamp is tightened over the connection. The pipe has a groove and the hose has a bead. To complete the connection the hose bead is...

Ok the fuel hoses on my car, I see "NOH-F" written on them, along with some numbers. Just googling fuel hose, it seems "NOH-F" is on most fuel hoses. But what does it mean? I tried to search Google for an answer, but nothing. I hope somebody ok here can tell me the meaning, if it's some sort of...

I have a plastic box and i am trying to move as much air through it as i can. I use a small garden hose to connect the box with some wall mounted fan (see the image attached). Given the small diameter of hose (2cm) and big fan (9.2cm) i am wondering if it would be better to use a smaller fan...

Anyone outright experience or understand tips and tricks to apart/separate a rubber-ended hose with the gas regulator/connector (as the right pipe mouth below but sorry no rubber-end hose pic) ? It indeed so hard so any clear idea, with keep everything intact unbroken on mind, how to do and by...

Hello, I am doing some quick experiments testing how pressurized air behaves when being ejected from a straight vs. curved object, and I am wondering if this is the expected behavior and a possibly quick explanation of why this would be behaving this way... I am using the model below and...

Hi everyone, What should be the considerations to choose the proper hose (max working press) installed at outlet air pressure vessels (11 bar) for industrial purposes? Please remark source\link. Also, I've found a table which lists the max sys operating press for 4 different fluids (fuel, oil...

In Bernoulli's equation, you have static, dynamic, and hydrostatic pressures equal to a constant. In one sense, I'm wondering if the dynamic part of the equation explains this since -> Pressure = (1/2*rho*velocity^2) and pressure can be expressed as a force / unit area, therefore, an increase in...

Well known examples of the force produced by pressurized water exiting a pipe: JetLev Water Propeled jet Pack. Hovering Car. I need to calculate the maximum for the thrust produced when the hose or pipe is bent rearward. Since this is similar to the case of a water bottle rocket, the guess...

As our family drove along the highway, one of my 3 college boys started commenting about the water towers we were seeing. We started a deep discussion about how water towers work and that led to a fascinating discussion about water supply in skyscrapers that are clearly taller than your average...

Please don’t laugh, this may sound a trivial question, but it is important. I have seen so many conflicting opinions, even from manufacturers. Some say, just use the biggest bore possible, others say use a small bore 8mm for a fully pumped system & a large bore 11mm for a gravity system. There...

Summary: water pressure issues what happens when you take water from a 3/4 inch pipe copper to 1/2 inch flexible braided hose through a filter for a 3/4 pipe back through a flexible braided hose 1/2 inch tube to 3/4 inch copper pipe?

Homework Statement Fire hose has diameter of 4.0 cm and flow rate of 10 L/s. There is pressure of 2.2 bar inside the hose. How high the water can go at best? Water density is 1.00E3 kg/m^3 and air pressure outside the hose is 1.0 bar. Homework Equations Flow rate $$ Q = Av $$ Newtons...

Hello! I hope you are all doing well! I've been always intrigued by fluid mechanics and decided to try out a quick experiment with my water faucet. After using some equations I found online [1] [2], I plugged a hose to the faucet and let the water run. I filled a 1 quart bowl and recorded the...

I am working on a design for a water powered drive shaft. The water source would be from a 2.5 inch diameter hose, at approx 75-100 psi. The goal would be to get 55-115 RPM from the shaft and max torque in the smallest possible handheld device. That being said, it seems my best options for...

If you have wire that has 100 ampere current but your load is only 0.5 ampere.. how come the load won't be destroyed by the powerful 100 ampere source? Or let's take the case of hose. If you have water running so fast inside a 10 inches diameter hose.. and you put a small hose between it.. the...

Hi There, Why is a pipe with a smaller diameter able to withstand a greater internal pressure than a pipe made from the exact same material and wall thickness but larger diameter? Thank you

Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 34 m. The water leaves the hose at ground level in a circular stream 4.0 cm in diameter. What minimum power is required to create such a stream of water? Every cubic meter of...

I have a diesel pump doing 900 lpm with a hose reel 30 meters long, the inside diameter of the hose is 32mm. The frictional loss for 30 meters of hose is 461.04 kPa. The Viscosity of Diesel is 4.5 mPas. I would like to know the final flow rate. thanks in advance

Hi, I have carried out an experiment on 2 hoses. Hose A, a typical garden hose of 15mm OD 10mm ID and hose B a polyester woven lay flat fire type hose of 52mm OD 49mm ID. When inflated to 4 bar pressure hose A didn't straighten and was only seen to bulge in the circumferential direction...

Good evening everyone, I have a pressure meter from where we determined a pressure drop of 5.5 psi (Initial pressure 45.5 psi, final pressure 40 psi). The working fluid is air. The diameter of one of the hoses that is connected to the pressure meter is 1/4". I wasn't able to take a picture of...

Homework Statement in this problem , the author assume that velocity inside the hose is very low , near to 0 . but , it's not stated in the question , it's the anaylsis of the author . How do we know that the velocity of water in hose is close to 0 , if it is not mentioned earlier? Homework...

Hello, I want to design a mechanism for tilting an air hose (not more than 10 kg) to a desired angle (anywhere between 0 and 90 degrees depending on operating conditions) and holding it there. I've tried googling this up but just can;t find what I was lookin for. Then I searched for...

Hi all, I'm considering an fluids example that's giving me an apparent contradiction when I consider it from the perspective of Bernoulli's Equation vs. the Equation of Continuity. What I'm thinking of is the common observation that putting one's thumb over a garden hose results in an increase...

Homework Statement A water hose is used to fill a large cylindrical storage tank of diameter D and height 2D . The hose shoots the water at 45 ∘ above the horizontal from the same level as the base of the tank and is a distance 6D awayHomework Equations Vx=Vt D=vit+1/2at^2 The Attempt at...

A thought came to me while pouring antifreeze into my car today. As I pour in the anti-freeze it fills to the brim and takes awhile to flow through the cooling-system. However, if I choke the hose a few times it for some reason swallows the antifreeze faster. Is this similar to the bottle-neck...

Homework Statement A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 6.7-cm-diameter hose delivering 490L/min through a 0.80-cm-diameter nozzle? Homework Equations...

So i noticed that when you put your hand really close to a spraying hose you don't really feel anything but when you move you hand further away it feels like it gets stronger. But how? I know that when the water leaves the hose the waters speed only drops not increases then why is it when i...

Homework Statement A nozzle with a radius of 0.250 cm is attached to a garden hose with a radius of 0.800 cm. The velocity of the water in the hose is 2.80 m/s and the velocity of the water in the nozzle is 28.7 m/s.s (a) Calculate the maximum height to which water could be squirted if it...

Homework Statement I'm doing an experiment where I'm trying to determine the velocity of a hose when fully turned on using projectile motion. I projected the hose at different angles (15,30,45,60,75,90 degrees) doing 3 tests on each 1. Here is an example I made with the a set of results -...

My daughter is doing a science experiment based on a launch loop (http://en.wikipedia.org/wiki/Launch_loop). I hooked a 2600 psi pressure washer to two 1/8" OD tubes and then tethered them to a board. We rolled a tennis ball over the top of it when the water was flowing through the tubes (not...

A while ago, pinkybear posted the following: Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 35 m. The water leaves the hose at ground level in a circular stream 3.5 cm in diameter. What minimum power is required to create...

Homework Statement A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter 6.60cm. the hose ends with a nozzle of diameter 2.20 cm. A rubber stopper is inserted into the nozzle. the water level in the...

Hello, First, thank you for any assistance. I am a mechanic and my Super want's me to design a back-pressure system that will simulate field use of my machines in my shop. We spray several types of fireproofing thru hose's that vary in length between 50 and 500 feet. We use blower's that...

Hi, I am trying to create a high-vacuum system using a diffusion pump and a mechanical roughing pump. I need to replace my mech. pump's rubber hose with something that will not leak into the vacuum. Any suggestions on what hose and hose fitting would work best to weld permanently to my base...

Hello, I am confused why when we turn on a faucet on small, the water doesn't accelerate out of the tap like you would expect from Bernoulli's equation where a reduced area means a high velocity. It seem's like the faucet only regulates flow rate but not the pressure. However, if you connect a...

Hi all, I have been searching for days (and trying many different formulas) to try and work out the force (thrust) produced by a water pump at the end of a hose (given a perfect frictionless world) and was hoping someone could help... The following specifications are given: Fluid...

Homework Statement Given: Water flows through a 15.24m long, 1.6cm diameter hose. pressure at the outdoor tap = 275.8kPa volumetric flowrate, Q = 7.5e-4 m^3/s (i.e. 7.5L for 10 seconds) viscosity of water, μ = 0.001 Pa*s density of water, ρ = 1000 kg/m^3 Look for: the roughness of...

ok thank you << Moderator's Note -- Do NOT delete your posts after you have received help. That is cheating, and it will not be tolerated here. You agreed to the PF rules when you joined here, and the rules are ver explicit about not altering your posts after you have received help. You...

Homework Statement A friend asking: A cart and a water hose: A water hose is spraying water at rate m_dot kg/sec, and at a given velocity V, on a cart with a mass M. The water hit the cart, and they are bounced back from it in an elastic collision (same velocity in relation to the cart...

Homework Statement A garden hose is used to fill a large metal container which can hold 24.0 L of liquid. If the radius of the garden hose's nozzle is 1.2 cm, and the speed of the water at this point is 272.0 cm/s, how long (in seconds) would it take to fill the container with water, assuming...

Homework Statement Homework Equations I am having some trouble starting this problem. At first look I would say that a conservation of mass will give V1*A1=V2*A2 for steady state incompressible fluid. Then I would solve for A2 and relate the two diameters but I don't have the velocity...

I just watched the walter lewin lecture on fluids, and he had an experiment where he was sucking it out of a hose when the hose was in a U-shape, and he was only able to bring the level up about a meter. However, when he got on a ladder and was sucking out the juice from the floor in the...

If a reservoir was at the top of a cliff and a house was immediately below it with another house at the bottom of the cliff would the latter throw the water further from a hose due to the steep descent?

Homework Statement Describe the energy changes that occur in the system shown below (The picture shows a water reservoir at the top of the diagram and then some pipes that leads to a hose and you can see the water coming out of the hose in an arc and hitting the ground.) as the water travels...

Homework Statement A cylindrical bucket, open at the top, is 28.0 cm high and 10.0cm in diameter. A circular hole with a cross-sectional area 1.73cm2 is cut in the center of the bottom of the bucket. Water flows into the bucket from a tube above it at the rate of 2.11×10−4 m3/s. How high will...

Lets say I have a tank of argon gas at high pressure, let's say around 17MPa. It is connected to a hose with a nozzle of a certain diameter d, and opened in ambient conditions, and the hose is used to pressurize a cavity, is there a simple way to calculate the nozzle reaction force, or the...

Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 35 m. The water leaves the hose at ground level in a circular stream 3.5 cm in diameter. What minimum power is required to create such a stream of water? Every cubic meter of...

Hi ! I was pointed to this forum to get some help and technical advice and verification of a new kind of low cost Space Tower: the Space Hose. In a nutshell it is about using a lightweight hose made from PE foil which is blown trough from the bottom and is using the frictional forces of the...