Main Article Content
During the flow of any fluid there is always some resistance to flow during the flow process. Sometime this resistance is very high and some time it is present but can be negligible or it is not of much importance to measure it or reduce it. This resistance is known as the drag forces. This greater resistance always require more energy to transport fluid because this force reduces power required for pumping fluid in any process. So, our main concern to all engineering process is to reduce these forces [Virk (1971); Savena (1964)] either by suitable design and by the addition of some foreign materials known as the drag reducing agents. It is convenient to separate the total drag forces into two components:
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.