The performance of the sudden contraction shown in Figure 6.9 was studied in the

Question

The performance of the sudden contraction shown in Figure 6.9 was studied in the laboratory. The goal of the study was to determine the head-loss coefficient, K, of the contraction, where the head loss, h_l, in the contraction can be expressed as h_l=KV_2^2/2g where V_2 is the velocity in the section downstream of the contraction. The laboratory study was conducted by fixing the diameter, D_2, of the downstream section at 150mm, using water at 20 degree C as the fluid, and fixing the flow rate at 42.41 L/s. The diameter, D_1, of the upstream section was varied between experiments, and the corresponding pressure differences, p_1-p_2, between the upstream and downstream sections were measured. The measured laboratory data were as follows: Perform a dimensional analysis on the variables and present the laboratory results in an appropriate no dimensional form that relates the pressure change to the characteristics of the contraction, fluid, and flow. Plot the laboratory results in dimensionless form. Use the results of the laboratory study to plot the head loss coefficient, K, as a function of the diameter ratio D_1/D_2. Estimate an empirical equation that relates K to D_1/D_2.

Explanation / Answer

About the K of the contraction, is is going to reduce since D1 is increising, so the velocity head is decreasing.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.