Can someone tell me what influence an angled wall has on the flow over a triangular weir compared to a "normal" vertical one if the wall is angled against the upstream as in the picture?
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Nil
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Make both and test them. A good learning experience. – Solar Mike Nov 30 '22 at 15:25
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I do not have that option – Nil Nov 30 '22 at 15:36
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TLTR: looks like google may be your friend: https://www.uobabylon.edu.iq/eprints/publication_3_3905_6015.pdf – Solar Mike Nov 30 '22 at 15:43
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1https://www.openchannelflow.com/blog/8-avoidable-errors-when-measuring-open-channel-flow – Solar Mike Nov 30 '22 at 15:55
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Thank you but both links are with pure vertical wall – Nil Nov 30 '22 at 17:50
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And warn you to make sure the wall is vertical… as the error gets large… – Solar Mike Nov 30 '22 at 18:37
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The formula for flow over a triangular weir where the wall is vertical is widely documented. However, I can't seem to find any documentation on how an outward rotation of the wall affects the flow – Nil Nov 30 '22 at 19:20
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You did not read one of the links I gave you very well then. – Solar Mike Nov 30 '22 at 19:28
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Yes it just says it has a significant impact but does not say anything about how it impacts? – Nil Nov 30 '22 at 19:52
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1They give you a reason, again read carefully. – Solar Mike Dec 01 '22 at 05:01
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I would think that at high flow rates the flow over an angled weir would tend to push more water over the weir. At lower rates there would be no difference. I imagine you owuld need to determine this emperically if this were the only way to build your weir.
Tiger Guy
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As one of the references I gave points out that the angle of the notch affects how the water sticks to, or separates from, the notch then that causes errors - and the reference point out that they can be large. So not so sure about your "no difference"... – Solar Mike Dec 01 '22 at 07:00