## Article Summary & FAQs

### What is major head loss?

In fluid flow, **major head loss** or **friction loss** is the loss of pressure or “head” in pipe flow due to the effect of the fluid’s viscosity near the surface of the pipe or duct.

### Key Facts

- Head loss of the hydraulic system is divided into
**two main categories**:**Major Head Loss**– due to friction in straight pipes**Minor Head Loss**– due to components as valves, bends…

**Major head losses**are a function of:- flow regime (i.e., Reynolds number)
- flow velocity
- pipe diameter and its length
- friction factor (flow regime (i.e., Reynolds number), relative roughness)

**Darcy’s equation**can be used to calculate**major losses**. The**friction factor**for fluid flow can be determined using a**Moody chart**.**The Darcy friction factor**is a dimensionless quantity used in the Darcy–Weisbach equation to describe frictional losses in pipe or duct and open-channel flow. This is also called the**Darcy–Weisbach friction factor**,**resistance coefficient**, or simply**friction factor**.- The
**Colebrook correlation**relates the Darcy friction factor, Reynolds number, and the relative roughness for fully developed flow in a circular pipe. - Sometimes, engineers use the
**pressure loss coefficient**,**PLC**. It is noted K or ξ (pronounced “xi”). This coefficient characterizes pressure loss of a certain hydraulic system or a part of a hydraulic system. - An increasing
**Reynolds number**indicates increasing turbulence of flow. As can be seen from the Moody chart, the Darcy friction factor also depends on the flow regime (i.e., on the Reynolds number).

## Major Head Loss – Frictional Loss

**Major losses**, which are associated with **frictional energy loss** per length of the pipe, depends on the **flow velocity, pipe length, pipe diameter, and a friction factor** based on the roughness of the pipe and whether the flow is laminar or turbulent (i.e., the Reynolds number of the flow).

Although the **head loss represents a loss of energy**, it **does not represent a loss of total energy** of the fluid. The total energy of the fluid is conserved as a consequence of the **law of conservation of energy**. In reality, the head loss due to friction results in an equivalent **increase in the fluid’s internal energy** (temperature increases).

By observation, the **major head loss is roughly proportional to the square of the flow rate** in most engineering flows (fully developed, turbulent pipe flow).

The most common equation used to calculate major head losses in a tube or duct is the **Darcy–Weisbach equation**.

## Darcy-Weisbach Equation

In fluid dynamics, **the Darcy–Weisbach equation** is a phenomenological equation, which relates the **major head loss**, or pressure loss, due to **fluid friction** along a given length of pipe to the average velocity. This equation is valid for **fully developed, steady, incompressible single-phase flow**.

The Darcy–Weisbach equation can be written in two forms (**pressure loss form** or **head loss form**). The head loss form can be written as:

where:

- Δh = the head loss due to friction (m)
*f*= the Darcy friction factor (unitless)_{D}- L = the pipe length (m)
- D = the hydraulic diameter of the pipe D (m)
- g = the gravitational constant (m/s
^{2}) - V = the mean flow velocity V (m/s)

Evaluating the **Darcy-Weisbach equation** provides insight into factors affecting head loss in a pipeline.

- Consider that the
**length of the pipe**or channel is**doubled**, the resulting**frictional head loss will double**. - At constant flow rate and pipe length, the
**head loss is inversely proportional to the 4th power of diameter**(for laminar flow). Thus, reducing the pipe diameter by half increases the head loss by a factor of 16. This is a significant increase in head loss and shows why larger diameter pipes lead to much smaller pumping power requirements. - Since the head loss is roughly proportional to the square of the flow rate, then if the
**flow rate is doubled**, the**head loss increases by a factor of four**. - The
**head loss is reduced by half**(for laminar flow) when the**fluid’s viscosity is reduced by half**.

Except for the **Darcy friction factor**, each of these terms (the flow velocity, the hydraulic diameter, the length of a pipe) can be easily measured. The Darcy friction factor takes the fluid properties of density and viscosity into account, along with the **pipe roughness**. This factor may be evaluated using various empirical relations, or it may be read from published charts (e.g.,, **Moody chart**).

## Darcy Friction Factor

There are two common friction factors in use, **the Darcy and the Fanning friction factors**.

**The Darcy friction factor** is a dimensionless quantity used in the Darcy–Weisbach equation to describe frictional losses in pipe or duct and open-channel flow. This is also called the **Darcy–Weisbach friction factor**, **resistance coefficient**, or simply** friction factor**.

The friction factor has been determined to depend on the **Reynolds number** for the flow and the degree of roughness of the pipe’s inner surface (especially for turbulent flow). The friction factor of laminar flow is independent of the roughness of the pipe’s inner surface.

The pipe cross-section is also important, as deviations from circular cross-sections will cause secondary flows that increase the head loss. Non-circular pipes and ducts are generally treated by using **the hydraulic diameter**.

## Relative Roughness

The quantity used to measure the **roughness of the pipe’s inner surface** is called the **relative roughness**, and it is equal to the average height of surface irregularities (ε) divided by the pipe diameter (D).

where both the average height surface irregularities and the pipe diameter are in millimeters.

If we know the relative roughness of the pipe’s inner surface, then we can obtain the value of the **friction factor** from the **Moody Chart**.

The Moody chart (also known as the Moody diagram) is a graph in a non-dimensional form that relates **the Darcy friction factor**, **Reynolds number**, and the **relative roughness** for fully developed flow in a circular pipe.

## Darcy Friction Factor for various flow regime

The most common classification of flow regimes is according to the Reynolds number. **The Reynolds number** is a dimensionless number comprised of the physical characteristics of the flow, and it determines whether the flow is **laminar or turbulent**. An increasing Reynolds number indicates increasing turbulence of flow. As can be seen from the Moody chart, the Darcy friction factor also highly depends on the flow regime (i.e., on the Reynolds number).