Swing Bowling
Swing Bowling is a technique used for bowling in the sport of cricket.
Practitioners are called swing-bowlers. Swing bowling is usually classed as a rapid bowling subtype.
Swing bowling is aimed at causing the ball to move in the air (or 'swing') while mainly delivering fast-paced balls to the batsman, hoping that the change in the flight path of the ball will deceive the batsman and cause them to play the ball incorrectly.
Swing bowling should not be confused with spin bowling which involves bowling slow-pace balls which primarily change direction after contact with the ground. Swing bowling involves using a newer ball. The bowling side will continually polish one side of the ball by applying saliva and sweat to it as well as rubbing it against their clothes to make it shine, while leaving the opposite side not bright.
The speed of airflow between the ball's rough and smooth sides would cause the ball to move in-flight onto the rough side and away from the polished side.
Main Forms of Swing:
In swing: Where the ball begins wider than the batsman and travels into the batsman’s body.
Out swing: Where the ball starts in line with the stumps but moves so that by the time it reaches the batsman it is slightly wider from the stumps.
Given that the shiny side will also get worn during play, swing bowling is usually effective when the ball is newer, with the older ball being more useful for spin bowling or other forms of fast bowling. The essence of swing bowling is to get the cricket ball to deviate sideways as it moves towards or away from the batsman through air.
The bowler makes use of six factors to do this:
• The raised seam of the cricket ball
• The angle of the seam to the direction of travel
• The wear and tear on the ball
• The liquid used in ball polishing
• The speed of the delivery
• The bowler's action
Both turbulent and laminar airflow contribute to swing.
Air in laminar flow separates earlier from the surface of the ball than air in turbulent flow, so that the spacing point moves on the laminar side towards the front of the ball. It remains toward the back on the turbulent flow side, inducing a greater lifting force on the turbulent airflow side of the ball. The net lift force calculated is not sufficient to take into account the amount of swing observed. The pressure-gradient force gives added force.
Weather Effect on Swing Ball
Cold and humid weather is said to boost swing. Colder air is denser and can therefore affect the differential forces experienced by the ball during flight. When looking at humidity, changes in humidity between 0 percent and 40 percent seem to have little or no effect on the swing of the ball; yet when approaching 100 percent humidity, "condensation shock" has been observed to enhance the swing of the ball.
Here you can know about conventional swing