Clik here to view.
Waterjetting 32c - more tests with polymers
In the last post on this topic I pointed out that one of early drivers to the use of long-chain polymers in water came from the reduction in friction that it provided to fluid flow through long pipes....
View ArticleClik here to view.
Waterjetting 32d - Cutting with polymer in the water
In the recent past I have written about the use of polymers in high-pressure jets and that they can significantly improve jetting performance, with no additional changes in the power or pump and...
View ArticleClik here to view.
Waterjetting 33a - Waterjet structure and its effect
When a waterjet first comes out of an orifice the flow (providing the upstream conditions are properly aligned) will form a cylindrical stream, with the jet pressure across that stream relatively...
View ArticleClik here to view.
Waterjetting 33b - More on flow inlet conditions
The structure of the jet flow from an orifice makes a tremendous difference to the ability that the jet then has in terms both of its range and its cutting ability. And one of the major factors that...
View ArticleClik here to view.
Waterjetting 33c - More on enhanced cutting performance
Frontal photographs taken of waterjets, regardless of pressure, show that the jet spray widens as the jet moves away from the nozzle. Yet, because of the erosion of the outer layers of the jet by the...
View ArticleClik here to view.
Waterjetting 33d - Nozzle oscillation along a contour
In the last post I reviewed, in part, Dr. Shunli Xu’s work on oscillating nozzles, and how they can, on occasion, almost double the penetration while also improving surface finish. The problem with...
View ArticleClik here to view.
Waterjetting 34a - Drilling holes with water jets
Looking back over the Waterjet Index I realized that while I have addressed different aspects of drilling holes with waterjets in various ways, I haven’t really brought it all together as a focused...
View ArticleClik here to view.
Waterjetting 34b - Cutting a hole.
There are several different aspects to be considered when planning a job entailing hole cutting, the accuracy needed for the hole(s) to be cut, both in shape and alignment, the quality of the wall and...
View ArticleClik here to view.
Waterjetting 34c - Holes, pressure and delamination
If you ever go to an Old-Time Miners celebration, you may watch a group of competitors drilling holes through rock by hand with a cold chisel and a hammer. (You can see an example here). In the...
View ArticleClik here to view.
Waterjetting 34d - Drilling small holes through steel and concrete
In the earlier posts in this section I have concentrated more on cutting the profiles of a hole, and the different ways in which this can be done efficiently. However there are many cases where the...
View ArticleClik here to view.
Waterjetting 34e - Hole completions and core removal
When I began writing about hole cutting and drilling, a month ago, I was intending to talk just about the relative efficiencies of cutting the core into larger pieces, rather than designing a cutting...
View ArticleWaterjetting 35a - an overview on video
This post is by way of an introduction to an occasional new feature of the site, where I will videos to different posts to help with understanding. Adding videos is not in my skill set, so this first...
View ArticleWaterjetting 35b - Cutting the Missouri Stonehenge video
The video that I posted last time did not fare as well as had been hoped, in making the trip from my computer to the blogger post, and so this week, to see if there are other ways of peeling the apple,...
View ArticleClik here to view.
Waterjetting 35c - Developing a waste removal shroud - video.
The short videotapes in this segment show the evolution of a combination of a waterjet and a suction line as a way of easily removing soil or sand relatively quickly. It is a subject covered in an...
View ArticleWaterjetting 35d - More video on hydro-excavation
In the evolution of the design of a waterjet/suction tool described in the last post I commented on the ability to balance the jets so that they did not spray material beyond the suction shroud. At the...
View ArticleWaterjetting 35e - A low cost version of the soil sucker
Posting will run just a little slow for a few weeks, as I run-through and catalogue the some 200 hours of video that I have amassed over the decades showing our waterjet research. There are a number of...
View ArticleWaterjetting 36a - Jet stripping of tires
Stripping tires to recover the rubber has been one of the topics that has come up on a number of occasions, and through a number of different tests we have been able to demonstrate that water jets can...
View ArticleWaterjetting 36b - Katrina anniversary and the power of water
When I began to write these posts, I wrote about the difference between overall jet force and the focussed effects of a very high-pressure but small diameter jet. At the time I made reference to the...
View ArticleWaterjetting 36c - Cutting walls
This is just a short video from back in the days when 1/2-inch tapes were still our way of recording, but before we reached the higher quality resolution of today. We had a problem in that the basement...
View ArticleWaterjetting 36d - Going through more complex walls.
This is a short post illustrating an early stage in our development of a light-weight tool that could be carried into building rubble, after a collapse, and drill down through it to provide access for...
View ArticleWaterjetting 37a - Removing Explosives
One of the major efforts carried out at the High Pressure Waterjet Lab at Missouri S&T during my tenure related to removing explosives and other energetic materials from different casings. The...
View ArticleWaterjetting 37b - How safe is it?
We began looking into the use of water jets to deal with energetic materials (a group that includes, but is not limited to, explosives) at the beginning of the 1980's. One of the earliest questions...
View ArticleWaterjetting 37c - A Drilling Diversion
I was asked some questions about waterjet drilling of holes the other day, and it is amusing to remember where it all started, more than 30-years ago. My apologies again for the quality of the video,...
View ArticleWaterjetting 37d - Underground Drilling with Waterjets
The last post showed some of the experiments that we carried out as we developed a tool for drilling "around corners", demonstrating the ability of a high-pressure water jetting system to turn from a...
View ArticleClik here to view.
Waterjetting 37e - Using Cavitation to disintegrate rock
In most mines the main objective is to recover as much of the valuable minerals contained within the host (or gangue rock) while minimizing cost. When miners have to go underground and haul the ore to...
View Article
