1,721,051 research outputs found
Design of a microcontrolled water fountain
No full textWater fountains have been used for thousands of years for utilitarian and aesthetic purposes. The design of a fountain provides an excellent opportunity as a multidisciplinary project for engineering and art students. In this paper, detailed design of an indoor fountain with a special effect feature is presented. Comprising of nine individual jets, the fountain produces letters of the alphabet, simple shapes, and symbols with water jets. A microcontroller is programmed to create and sequence through interesting arrangements of water displays. With a total material cost of $550, this design, or variations of it, can be adopted for various implementations in fluids and design courses. Suggestions for student design projects are also made
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Wind-related heat transfer coefficient for flat-plate solar collectors
No full textExperiments were performed to evaluate the convective heat transfer coefficient for aflat plate mounted in a wooden model of a roof of a building. The experiments were carried out in a closed-circuit wind tunnel and included parametric adjustments of the roof tilt and Reynolds number, based on the length of the plate. The roof tilt was set at 0, 30, 45, 60, and 90 degrees and the Reynolds number ranged from 58,000 to 250,000. A transient, one lump, thermal approach was used for heat transfer calculations. Due to a separation bubble at the leading edge of the model, i.e., the roof, at angles of attack of less than 40 degrees, the flow became turbulent after reattachment. This resulted in a higher heat transfer than previously reported in the literature. At higher angles of attack, the flow was not separated at the leading edge and remained laminar. The heat transfer coefficient for higher angles of attack, i.e., a \u3e40 deg, was found to be approximately independent of the angle of attack and in good agreement with the previously published results. © 1987 by ASME
Fluid Motion Devices
No full textObjective: Develop low-cost interactive devices that exhibit fluid flow phenomena
Meandering
No full textI am writing to present a novel device that demonstrates the counterintuitive trajectory of water as it flows down on what appears to be a uniformly smooth surface (Fig. 1). While our intuition anticipates a linear descent by gravity, this simple device reveals a mesmerizing display of meandering water flow. Minute surface imperfections, such as microscopic scratches or variations in wetting ability resulting from surface coatings, introduce an element of randomness to the water stream, as shown in the accompanying image. (Red food coloring was added to the water for visual effect.) An online video of the demonstration is available
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