Lnewqban's latest activity
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Lnewqban reacted to Baluncore's post in the thread Can a flow created by a fan show an Edge effect when hitting a wall? with
Like.
What is the axial separation, between the fan outlet, and the circular plate? -
Lnewqban replied to the thread Can a flow created by a fan show an Edge effect when hitting a wall?.Please, see: https://www.sciencedirect.com/topics/engineering/boundary-layer-separation The size of the straight and plain wall respect...
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Lnewqban reacted to 256bits's post in the thread Undergrad Why is water pressure increased in a plastic bag in a bucket? with Like.
The hydrostatic pressure at the clay surface will be the same whether the clay is enclosed in a bag, or free. While higher pressure...
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Lnewqban replied to the thread High School Fan is pushing in the front and sucking from the back.At the tip of each blade, there is also a reversed flow or vortex moving air and dust from downstream to upstream due to pressure...
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Lnewqban reacted to russ_watters's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Yeah, some people don't like the implication of negative pressure in the word; Absolute pressure can't be negative. But to engineers...
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Lnewqban reacted to berkeman's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Ah, got it. Well, I just checked our portable fan (which has flat blades) and indeed the dust accumulation is on the front of the fan...
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Lnewqban reacted to berkeman's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Cheaper fans use flat blades at an angle. Better fans use airfoils at an angle (like a propeller). Here is a good PF Insights article...
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Lnewqban reacted to russ_watters's post in the thread High School Fan is pushing in the front and sucking from the back with Like.
Yes, though for your typical desk or central air conditioning fan the air can be considered incompressible for calculation purposes...
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Lnewqban replied to the thread High School Fan is pushing in the front and sucking from the back.The blades of any type of fan transfer kinetic energy into the mass of gas that is surrounding them. That energy is observable as...
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Lnewqban replied to the thread Control type problem from mechanics.By accelerating its small mass (m) along the bar, the muscular force of the bug will need to induce a vertical component equal to...
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Lnewqban replied to the thread Why must residential electrical systems be connected to Earth (soil)?.Wherever persons can be in contact with electricity with voltage above 60 volts, the salty fluids inside their bodies can become a...
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Lnewqban reacted to FactChecker's post in the thread Undergrad Find the Number of Triangles with Like.
I wrote a program to do brute force counting and its answer matches that of @bob012345 in post #15. I have not thoroughly examined the...
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Lnewqban reacted to Steve4Physics's post in the thread Four L-shaped members: Mechanical Analysis Problem with Like.
Happy New Year @Lnewqban! Yes, I see what you mean. So, for example, with A remaining pinned and with B free to move horizontally, the...
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Lnewqban replied to the thread Four L-shaped members: Mechanical Analysis Problem.Happy New Year, Steve! It seems to me that, due to joints C and G, if any of the pinned-supports is replaced by a simple horizontal...
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Lnewqban replied to the thread Pressure difference between two points in a tapered pipe.If you are normally swimming, your ears feel atmospheric pressure only. If you then are diving at a depth of 10 meter under the surface...