This study aims to evaluate the energy loss at manhole. Experimental model with straight pipes (D=0.2 m for diameter, 18.5 m for length) and four rectangle-shaped manholes (0.26 m for width, Dm=0.12 m for length) was used. Energy losses at manholes, Δ H, were determined as the difference of hydraulic gradient lines at the center of the manhole extended from both upper and lower side of pipes. The energy loss coefficient was given as K=(Δ H)(2g)/v2. Obtained coefficients converged their range from 0.02-0.12 to 0.04-0.06, according to the increase of the water velocity. We concluded that the reason of this comparatively smaller K values was due to the smaller diameter ratio; Dm (manhole diameter or length)/D(pipe diameter), compared to the results of other experiments.
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Research Article|
October 01 1997
Energy loss at surcharged manholes - model experiment
Takashi Sakakibari;
Takashi Sakakibari
*Public Works Research Institute, Ministry of Construction, Asahi 1, Tsukuba City, 305, Ibaraki, Japan
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Shuji Tanaka;
Shuji Tanaka
*Public Works Research Institute, Ministry of Construction, Asahi 1, Tsukuba City, 305, Ibaraki, Japan
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Toshihiro Imaida
Toshihiro Imaida
**Fukken Co. Ltd, 10-11, 2-chome Hikari-Machi, Higashi-ku, Hiroshima 732, Japan
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Water Sci Technol (1997) 36 (8-9): 65–70.
Citation
Takashi Sakakibari, Shuji Tanaka, Toshihiro Imaida; Energy loss at surcharged manholes - model experiment. Water Sci Technol 1 October 1997; 36 (8-9): 65–70. doi: https://doi.org/10.2166/wst.1997.0645
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