## 1. Internal Flow (Turbulent Flow Correlations)
### 1.1. Gnielinski's correlation
![[Gnielinski]]
### 1.2. Dittus-Boelter equation
![[Dittus-Boelter]]
### 1.3. Sieder-Tate
![[Sieder-Tate]]
## 2. External flow
Flow parallel to flat plate
#### 2.1.1. Laminar flow
$Nu=0.644\ Re_L^{1/2}Pr^{1/3} \ \ \ \ \ \ while\ Re > 5\times 10^5$
#### 2.1.2. Turbulent flow
$Nu=0.644\ Re_L^{1/2}Pr^{1/3}$
#### 2.1.3. Flow over Cylinder
##### 2.1.3.1. Churchill Bernstein
![[Churchill-Bernstein]]
### 2.2. Flat Plate
![[Flat Plate]]