Design, fabrication, and testing of a rectangular glass laboratory flume

Date

12-2015

Degree

Bachelor of Science in Agricultural and Biosystems Engineering

Major Course

Major in Land & Water Resources Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Roger A Luyun Jr.

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

The study focuses mainly on the design, fabrication, and testing of a rectangular glass laboratory flume. The laboratory flume is a structure that is used to model and analyze the flow of water in an open channel. The designed laboratory flume is a free-overflow recirculating flume type and its main parts are the headbox, the tailbox, the pump and pipelines, and the test channel. The length, width, and height of the test channel were 3.95, 0.5, and 0.7 m, respectively. Gravimetric methos was used to measure the discharge rate for a particular head in the testing of the flume. The rating curve generated was a polynomial function with the formula Q=4.3986h²+0.1129h and a correlation coefficient of 0.997 implying a strong relationship between the variables. The range of uniform flow occurring in the channel is between the heads of 1.5 to 3.0 cm. Higher heads than 3.0 cm still resulted in turbulent forms. A rectangular broad-crested weir (P = 25.5 cm L = 30.5 cm B = 50.0 cm) and a contracted sharp-crested weir (P = 12.0 cm Bc = 40 cm) were calibrated to provide further testing to the flume. The gauging stations for the broad-crested and sharp-crested weirs were located at 39.5 cm and 40.0 cm from the upstream face of the weirs, respectively. The calculated discharge coefficients for the weirs were 0.9130 for the broad-crested and 0.6570 for the sharp-crested weir. Reliability and high correlation were found among the relationships of the data. The established weir equation for the rectangular broad-crested weir is Q = 0.8035 (H) ^1.5109 while the established weir equation for the contracted rectangular sharp-crested weir is Q = 2/3 (0.6568) √(2g) (0.4 - 0.2H)H^3/2. The laboratory flume was found to be useful and reliable for the purpose it was designed for. It provides convenience for basic hydraulic studies, flow measurements, and hydraulic structure calibrations.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2015 A2 /V35

Document Type

Thesis

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