Since airflow speed can significantly affect the convective heat transfer rate, a number of ventilation systems work by increasing local air movement to accelerate heat dissipation (Arkin et al., 1991, McArthur, 1987, Mitchell, 1976, Turnpenny et al., 2000, Turnpenny et al., 2000).
Q. How do you increase the coefficient of convective heat transfer?
Generally Heat transfer coefficient of fluid increases with the increase in Reynolds number or velocity of fluid when it flows through a pipe.
Table of Contents
- Q. How do you increase the coefficient of convective heat transfer?
- Q. Why does flow increase heat transfer?
- Q. How does laminar flow affect heat transfer?
- Q. Is laminar flow better for heat transfer?
- Q. How does Reynolds number affect heat transfer?
- Q. Is there any relationship between the Reynolds number and the convective heat transfer?
- Q. What is the effect of Reynolds number?
Q. Why does flow increase heat transfer?
Heat transfer coefficient is the ability of fluid to transfer heat when it comes in contact with a solid surface. Higher flow rate (velocity) indicates higher generattion of eddies. These eddies are responsible for heat transfer. Hence higher flow rate, higher the heat transfer rate.
Q. How does laminar flow affect heat transfer?
Defined as fluid gliding through a channel in smooth layers, where the innermost layer flows at a higher rate than the outermost. Laminar flow develops an insulating blanket around the channel wall and restricts heat transfer.
Q. Is laminar flow better for heat transfer?
Under turbulent flow conditions, the increase in heat transfer rate is more significant than that under laminar flow conditions. This is due to the increase in the Reynolds number of the flowing fluid in turbulent flow. The turbulent effects become a dominant factor over secondary flow at higher Reynolds number.
Q. How does Reynolds number affect heat transfer?
The mechanism of enhanced heat transfer by the nanofluid is due to the higher thermal conductivity of the particles compared with the fluid. This shows that the heat transfer coefficient increases with the volume fraction and that the heat transfer coefficient decreases with increasing x/D at Reynolds number of 700.
Q. Is there any relationship between the Reynolds number and the convective heat transfer?
The convective heat transfer coefficient increases with the increase of Reynolds number in an inclined tube. In an inclined tube, the surface friction coefficient of the length tube decreases when the Reynolds number is increased.
Q. What is the effect of Reynolds number?
Near the critical angle, increasing the Reynolds number decreases the skin-friction magnitude inside the separation bubble and narrows the low-pressure region around the shoulder. The combination of these two effects results a steady decrease of boattail pressure drag with increasing Reynolds number.
