Amit Goswami

PhD. Researcher

Nano-technology and bio-engineering research group

Research Topic

‘Use of surface coatings in phase-change enhancement’.

Amit Goswami.jpg

Amit joined IT Sligo in March 2020 as a PhD student under the supervision of Dr. Gerard McGranaghan and Prof. Suresh Pillai.

Amit’s research project is titled ‘Use of surface coatings in phase-change enhancement’.

Phase-change heat transfer is common in day-to-day applications, like in the cooling of many electronic circuits. The general idea of using a phase change is to exploit the large energy associated with a phase transformation process. Single-phase heat transfer has been utilized enormously in industries. However, two-phase heat transfer due to its highly complex nature still has limitations for practical use.

For example Condensers are critical units in most power plants. It is observed that the condensation can take place on a surface in two manners: film-wise condensation and drop-wise condensation.

  • Film-wise condensation refers to the formation of the condensate on a surface in the form of a film.

  • Drop-wise condensation occurs in the form of tiny droplets which when they grow bigger with condensation, are removed from the surface.

Thus, film-wise condensation limits the direct contact of the condensing vapour with the heat transfer surface due to the presence of the condensate film over the surface. Drop-wise condensation can efficiently drain the condensate in the form of droplets, hence has continuously exposed heat transfer surface for maintained and enhanced condensation. Many studies have reported the heat transfer coefficients in drop-wise condensation to be an order of magnitude higher than film-wise condensation owing to this property.

Schematic of a superhydrophobic surface

Figure 1: Schematic of a superhydrophobic surface with high droplet mobility and self-cleaning.

The most adopted technique to achieve drop-wise condensation relies on creating a low surface energy surface that can efficiently remove the condensate droplets. These surfaces show extremely high mobility of condensate droplets, also resulting in a cleaning effect on the surface by the moving droplets. Therefore, low energy surfaces not only provide a high-efficiency condensation but also reduced surface contamination arising from various practical conditions (Figure 1). However, the practical realization of dropwise condensation in industrial conditions still is a challenge. Due to the high temperatures and pressures encountered in most industrial-scale heat exchangers (eg. Power plants), even the drop-wise condensation transforms to film-wise mode in a short period of time, therefore, degrading process efficiency.

 

Therefore, the primary objectives of Amit's research work are-

  1. Identification and development of surface coatings with low surface energy and high antifouling and self-cleaning properties.

  2. Developing micro/nano surface features to promote condensate removal in severe industrial process conditions.

Before joining IT Sligo, Amit completed a bachelor’s and master’s degree in 'Mechanical Engineering’ from the Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram India in May 2019. In his bachelor’s degree, he specialized in ‘Design and manufacturing’. Amit’s master’s specialization was in 'Advanced manufacturing'.

During his graduate and post-graduate degree, Amit benefitted from the comprehensive exposure to the core areas of mechanical engineering and developed a strong interest in various manufacturing technologies. For his thesis, he worked closely with various advanced manufacturing technologies like freeze casting, micro-machining processes and additive manufacturing. During his graduation period, he had the opportunity of five months industrial internship (May 2018-Oct 2018) at ‘Delvac Pumps Pvt. Ltd., India’, where he worked with the design and analysis of a vacuum frying system utilized in various food industries.

Amit’s second postgraduate project on ‘Air-water two-phase flow pattern visualization in mini channels propelled his interest towards heat transfer engineering research. Amit applies his understanding of various advanced micro/nanomanufacturing techniques to develop surfaces that can be utilized for enhanced heat transfer applications. The research work is in collaboration with MiliDyne OY, Finland for technical and commercial support.

His work has been largely focused on a wide literature review and fabrication of a three-dimensional hybrid surface. It is estimated that the hybrid surface would be able to enhance the condensate removal by wettability difference and pressure difference due to the presence of micro-scale grooves. A review article titled ‘Surface Modifications to Enhance Dropwise Condensation’ is currently in a peer review phase.

Amit has been involved in research collaborations with the ‘Nano-technology and bio-engineering research group’ led by Prof. Suresh Pillai. He has contributed to two research articles in the form of a book chapter and a research review paper which are currently under review.

He believes that the freedom he has received to decide his own research direction has helped a lot in exploiting his background in manufacturing technology in heat transfer science. The guidance and supervision by Dr Gerard McGranaghan and Prof. Suresh C. Pillai have been very helpful in proceeding with the research work and the positive research environment at IT Sligo is effective in keeping his hopes and motivation thriving.

 

Publications:

Submitted manuscripts-

  1. ‘Surface Modifications to Enhance Dropwise Condensation’, Amit Goswami, Suresh C. Pillai, Gerard McGranaghan*, (Under revision)

  2. ‘2D Materials for Wastewater Treatments’, Nishanth Thomas, Amit Goswami, Kris O’Dowd, Gerard McGranaghan, Suresh C. Pillai*, (Under revision)

  3. ‘2D MoS2-based photocatalysts: Structure, mechanisms and environmental applications’, Nishanth Thomas, Snehamol Mathew, Keerthi M Nair, Kris O’Dowd, Parnia Forouzandeh, Amit Goswami, Gerard McGranaghan, Suresh C. Pillai*(Under review)

Under preparation-

  1. Antifouling surface coatings for heat exchangers’, Amit Goswami, Suresh C. Pillai, Gerard McGranaghan*.

  2. ‘Advances in marine antifouling nanoscale polymer-based coatings’, Amit Goswami, Gerard McGranaghan, Suresh C. Pillai*.