Venturi Effect- Profound Lessons from a Road Rogue

 

I was sitting at the back of the class and playing book cricket. Our Physics teacher was working hard on explaining the Venturi effect. “Remember! Energy is neither created nor lost. It gets converted from one state to the other,” he said. “No loss, no gain,” I found the concept interesting.  

Book cricket was my fiefdom. I made rules and decided when to start and finish the match. “Time for a drink break,” I told the cricketers, closed the book pitch, and gave all my ears to the teacher. “So, when the water in a pipeline comes across a choke point, the pressure inside the tube at the choke increases, and the velocity decreases. The moment it comes out of the choke, the pressure falls dramatically, and the speed of the water increases correspondingly. People designing the layout of long-distance pipelines incorporate it to install inline flow meters. It also makes sure that pipelines do not get clogged,” he said. Intuition told me it would be a sure question in the examination. I studied the part well.  Sure enough, the question was there. I answered well and got good marks for my answer. It helped me pass the examination. That day, the essentials of the Venturi principle became sedimented somewhere deep within me. 

Experimenting with life is integral to adolescence. When I was growing up, smoking was considered macho. I picked up smoking early in life and became a heavy smoker. One day, I decided to cut down on my nicotine intake. A friend suggested I use a filter cum cigarette holder. I could fix my cigarette into the pen-like filter and smoke.  

I learned from the manual that it used the Venturi principle to extract nicotine from cigarette smoke before it reached my lungs. The cigarette certainly looked longer, but the filter stole the punch from the smoke.  I opened the filter in the evening to clean it. It was one of the most repulsive sights. A thick, dark, brown, sticky substance stared at me from the filter hold. It was nicotine that would have otherwise gone into my lungs. I did not like the sight.  In two days, I stopped smoking cigarettes using the filter. I threw the filter away. It took me another 30 years to throw cigarettes away for good. Somewhere in between, I also forgot about the venturi.   

Last Sunday, I saw the venturi principle in action once again.  

The six-lane road was for three vehicles abreast in each direction. The median ensured it. When commissioned, the flyover and road would have drained the flow either way very fast. Over the years, the density and volume of vehicular traffic increased manifold. Now, it remains packed beyond capacity almost throughout the day. That Sunday, I was on the side heading for the airport or beyond. All traffic leaving Bengaluru (Bangalore) had to take this route. The flyover was crowded, with vehicles of all shapes and sizes. Traffic moved at snail's speed.  

The left side of the flyover had a channel with two tails. The channel split into two tails about 50 meters from the entrance. One was a lean-mean left hook that served as the exit. It was wide enough to take just one vehicle. I was heading for it. The straight tail rejoined the main lane at the end of the flyover. The straight part was the problem. People on the mainline used it as a shortcut to overcome the congestion and join the main line ahead. Slow traffic creates unruly drivers. The slower the traffic, the ruder those inclined became. Vehicles ahead of me had already choked the entrance to the funnel. I had no option but to queue up because I had to take the exit. 

According to the rules of fluid mechanics, flow at the outer bend is faster than the flow at the inner bend. This law applies even to vehicular traffic flow. I use the lessons I learned in science classes in my daily life. I kept my car to the outer side of the funnel within the lane, directly facing the entrance and behind the car ahead of mine. I was sure I would be the one to enter the funnel whenever that car moved.  

The banks of a river define its course, and the laws of physics govern its waters. That day, “might is right” was the operative law on the road. Indian roads can be elastic beyond imagination. It can expand in any direction. One needs only to insert a tyre or nose of a vehicle. A new line will automatically take shape. Lanes lose significance or relevance.  It is not rare to see two-wheelers on the pedestrian path or cars nonchalantly coming against the flow, throwing one-way rules to the wind. 

The car on my right tried to nudge me to the left and out of the entrance. Then, from nowhere, a car came from the left, honking loudly, and stopped at about 60 degrees to the entrance. He then let his car roll into the gap between my car and the car in front. I knew he had got the better of me. He looked at me like the victor and let his car roll ahead. I saw a vicious, wicked smile on his face as he looked at me with contempt. He crawled ahead, and I rolled behind. When we reached the exit, he gunned his car ahead.  The road was empty. 

 

I continued driving behind him at my pace. There was enough space for everybody on the road. I could see the traffic light in the distance. I pulled up at the traffic light because it had turned red. The man who burned his tyres to race ahead was there. I looked at him and shrugged my shoulders. Then, two bikers snaked their way between our cars and parked right in front of his car. The light turned green. I could hear him honk loudly, even as I rolled ahead.  

Life is like that. There are many people around us taking shortcuts and gaining short-term advantages. They are in perpetual competition with everybody and for everything. They derive happiness in victories they notch up, even when insignificant.  It is how they find self-esteem and realisation. Life is nothing beyond a race from one traffic light to the next. It is beyond them to comprehend that life is a marathon.  When it is time for reckoning, they often find people they had left behind through unscrupulous means and manipulations standing ahead, relaxed, smiling, and happy.  

Reflecting on what happened, I recalled my teacher’s words. There is no loss of energy, just a change of form. How true, I thought. We waste a lot of energy daily on competitions that we create unwittingly. Maybe it is time to pause and look at the road we took so far. Did we edge someone out only to find them overtaking us at some traffic light ahead?