A liquid flowing through a tube is turbulent. In which case will the maximum change in heat transfer coefficient occur?

• A. Diameter of the tube is increased 4 time maintaining the ratio of liquid flow constant
• B. Diameter of the tube is increased 4 times maintaining the velocity of flow constant
• C. Diameter of the tube is increased 2 times maintaining the rate of liquid flow constant
• D. Diameter of the tube is increased 2 times maintaining the velocity of flow constant
• E. microns