EX07 6/10/2019

Hi Class,
This is EX07

You can take the EX at home, so you don’t have to come to school today. But if you want to come to school, please use the club room, computer lab on the 2nd floor, library in Namm, if V511 is not open yet.

Submit all work to me ( send email to mnakamura@citytech.cuny.edu ) or leave it in my mailbox located in Mech Dept office by 5:00pm today.

Good luck!

Dr. Masa Nakamura

Day07 6/10/2019

Hi class

How are you today? Did you enjoy the weekend?

As I discussed, we don’t have a lecture today. Instead, we will have only an exercise (EX7). I will put the EX in openlab around 2:30 today.

You can take the EX at home, so you don’t have to come to school today. But if you want to come to school, please use the club room, computer lab on the 2nd floor, library in Namm, if V511 is not open yet.

Dr. Masa Nakamura

EX06 6/7/2019

Example – Calculating Reynolds Number

A Newtonian fluid with a dynamic or absolute viscosity of 0.38 Ns/m2 and a specific gravity of 0.91 flows through a 25 mm diameter pipe with a velocity of 2.6 m/s.

The density can be calculated using the specific gravity like

ρ = 0.91 (1000 kg/m3)

= 910 kg/m3

The Reynolds Number can then be calculated using equation (1) like

Re = (910 kg/m3) (2.6 m/s) (25 mm) (10-3 m/mm) / (0.38 Ns/m2)

= 156 (kg m / s2)/N

= 156 ~ Laminar flow

(1 N = 1 kg m / s2)