hisay lama

Schematic of drying sessile droplet of comprising particles In this article, the derivation for the depinning time associated with the sessile drop evaporating on a substrate and maintained at different temperatures is illustrated. The derivation goes below -     The droplet evaporating at dissimilar rates are observed to depin nearly at the same scaled time $t/t_f$ (where $t_f$ is the time for complete evaporation). The argument can be supported by a rudimentary mathematical framework illustrated below: \begin{equation}    \frac{dV}{dt}|_{\Delta T} = -V_E|_{\Delta T} \end{equation} where, $V$ is the instantaneous volume of water in the droplet, $V_E$ is the evaporation rate which is a constant at the particular $\Delta T $ (difference of substrate and environment temperature), the negative sign at r.h.s indicates the reduction in volume with time. Now by integrating Eq(1), \begin{equation}   V(t)|_{\Delta T} = -t\,V_E|_{\Delta T}...

As the title suggests, the subject is bit philosophical, but still, I thought to pen it down in my blog. For me, every day is a new day with a new experience in all aspects either be personal or professional.  At the end of the day, before I sleep, I always have many unanswered questions that keep my mind very much engaged. A novel profession like that of scientists gives me the opportunity to think, discuss and debate. Although I find this profession too challenging and lively but very often I do get into a very difficult state, which is a state of confusion and fear. The question that I have to face on a regular basis are, 1. What and Why should I do something today? 2.  Is this the right way to do it? 3. What will happen if I fail? Are there any alternative? Do I have any backup? and many more... Although I am not very qualified to write a blog on such a topic but still believe myself as a novice researcher eligible for sharing the experience. At the moment, I believ...