Question
Problem 01.069 - Surface Tension Analysis A solid cylindrical needle of diameter d, length L, and...
Problem 01.069 - Surface Tension Analysis A solid cylindrical needle of diameter d, length L, and density pn may float on a liquid surface. Neglect buoyancy and assume a contact angle of 0°. Calculate the maximum diameter needle that is able to float on the surface. Assume the needle to be made of steel with a specific gravity of 7.84. mm
Answers
The weight of needle acts downwards & surface tension force acts upwards U del (Needle cylindrical) W Force balance equation 2L- 89d2XL = 0 80 dmax= 8xo.o73 - 109 Tx 7840 x 9.81 dman = 0.00155m given data SG = 7.84 3= 7840 kg/m3 T=0.073 N/m (for water dmax 1.Ssmm dmax ~ 1.6mm
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