A venturi tube may be used as the inlet to an automobilecarburetor. If the 2.0-c

Question

A venturi tube may be used as the inlet to an automobilecarburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cmdiameter, what is the pressure drop in the constricted section foran airflow of 3.0 cm/s in the 2.0-cm section? (r = 1.2kg/m3.)
70Pa
85Pa
100Pa
115Pa
81Pa A venturi tube may be used as the inlet to an automobilecarburetor. If the 2.0 - cm diameter pipe narrows to a 1.0 - cmdiameter, what is the pressure drop in the constricted section foran airflow of 3.0 cm/s in the 2.0 - cm section? (r = 1.2kg/m^3.) 70Pa 85Pa 100Pa 115Pa 81Pa

Explanation / Answer

Formula: The pressure drop P = 0.5((d14 /d24 )   - 1 )v12     This relation is obtained by first using contunity relationand then using Bernouli equation.                            P = 0.5* 1.21 ( ((2.0)4 /(1.0)4 )   - 1 )(3)2                                                 = 81 Pa This relation is obtained by first using contunity relationand then using Bernouli equation.                            P = 0.5* 1.21 ( ((2.0)4 /(1.0)4 )   - 1 )(3)2                                                 = 81 Pa                                             = 81 Pa

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