Author
C. Ramaswamy
Bio: C. Ramaswamy is an academic researcher from IBM. The author has contributed to research in topics: Boiling & Bubble. The author has an hindex of 3, co-authored 3 publications receiving 219 citations.
Topics: Boiling, Bubble, Nucleate boiling, Superheating, Heat transfer
Papers
More filters
TL;DR: In this article, high-speed photography (1500 frames/s) bubble growth data on microporous structures immersed in a pool of dielectric coolant (FC-72) were obtained.
103 citations
TL;DR: In this article, the effect of varying the pore size, pitch and height on the boiling performance was studied, with fluorocarbon FC-72 as the working fluid, and the authors found that a larger pore and smaller pitch resulted in higher heat dissipation at all heat fluxes.
Abstract: The current study involves two-phase cooling from enhanced structures whose dimensions have been changed systematically using microfabrication techniques. The aim is to optimise the dimensions to maximize the heat transfer. The entranced structure used in this study consists of a stacked network of interconnecting channels making it highly porous. The effect of varying the pore size, pitch and height on the boiling performance was studied, with fluorocarbon FC-72 as the working fluid. While most of the previous studies on the mechanism of enhanced nucleate boiling have focused on a small range of wall superheats (0-4 K), the present study covers a wider range (as high as 30 K) A larger pore and smaller pitch resulted in higher heat dissipation at all heat fluxes. The effect of stacking multiple layers showed a proportional increase in heat dissipation (with additional layers) in a certain range of wall superheat values only. In the wall superheat range 8-13 K, no appreciable difference was observed between a single layer structure and a three layer structure. A fin effect combined with change in the boiling phenomenon within the sub-surface layers is proposed to explain this effect.
73 citations
TL;DR: In this paper, the authors developed a semi-analytical model to predict the bubble departure diameter, frequency, and nucleation site density for a boiling enhancement structure, and the model was used to calculate the total heat dissipated from the structures.
61 citations
Cited by
More filters
TL;DR: In this paper, a comprehensive review of published articles addressing passive enhancement of pool boiling using surface modification techniques is provided, including macroscale, microscale, and nanoscale surfaces, as well as multiscale (hybrid-scale), and hybrid-wettability techniques.
343 citations
TL;DR: In this paper, several researches on the micro/nanostructured surfaces that have been designed to enhance boiling heat transfer are introduced and closely reviewed, and the special features of the existing surfaces capable of enhancing BoT are summarized.
277 citations
TL;DR: In this article, simulated copper chips were used in a pool boiling setup with water boiling at atmospheric pressure, and the results showed that the mechanism at work for the bubble dynamics was the ability of the surface to pull liquid through the channels to induce heat transfer.
210 citations
TL;DR: In this paper, the results reported in recent investigations on pool boiling and flow boiling from micro/nanostructured surfaces were included, and a comprehensive overview was provided. But, the results of these studies were limited to the micro and nano scale.
179 citations
TL;DR: Experimental results indicate that use of the CNT-enabled, purely nano-structured interfaces appear to improve boiling heat transfer only at very low superheats, as compared to the smooth surfaces.
177 citations