Spacing effect on pool boiling performance of three triangular pitched and vertically oriented tubes

TL;DR

This study investigates how the spacing between vertically oriented triangular tubes affects boiling heat transfer and bubble behavior in ethanol, revealing that spacing comparable to bubble departure diameter optimizes heat transfer.

Contribution

It provides systematic experimental data on the influence of tube spacing on boiling performance in vertically oriented tube bundles, an area with limited prior research.

Findings

Long spacings have negligible effect on HTC and bubble behavior.

Spacing near bubble departure diameter promotes slug flow beneficial for heat transfer.

Narrow spacings can enhance HTC in low length-to-diameter ratio bundles.

Abstract

There is a scarcity of available data on boiling process in vertically oriented tube bundles in accessible sources. Lack of systematic studies is limiting further expansion of this highly efficient process of heat transfer into heat recovery field. In this paper boiling process of three triangular pitched and vertically oriented tubes has been studied in ethanol at 78$^{\circ}$C. The main focus of this work was to study the effect of tube spacings on heat transfer coefficient (HTC) and bubbles behavior (bubble departure diameter in particular) that were visualised with the help of a high speed camera. Experiments were performed in a wide range of tube spacings (from 10.75 to 0.25 mm) and heat flux densities (from 3 to 70 kW/m$^2$). The obtained results show that, long spacings i.e., much longer than bubble departure diameter, have no influence on HTC as well as on bubbles behavior. On the contrary, the spacings on the order of the bubble departure diameter tend to create slug flow in the bundle, that is very beneficial for the heat exchange at low heat fluxes. Finally, narrow spacings that are much shorter than the bubble departure diameter have shown the potential to enhance the HTC in tube bundles with low length to diameter ratios.