Pool boiling heat transfer on finned tubes—an experimental and theoretical study

Modeling and experimental study of nucleate boiling on a vertical array of horizontal plain tubes

“…As an example, according to Refs. [9,11,14,26], the heat transfer coefficient diminishes with inter-tube spacing under partial nucleate boiling conditions, an opposite trend to that observed by Hahne et al [13].…”

“…It must be stressed that Eq. (13) has been developed based on a tube bank of 55 rows and experimental data for R22 and ammonia. Thus, its use for larger number of rows is questionable.…”

Boiling heat transfer of water on smooth tubes in a compact staggered tube bundle

“…Browne and Bansal [1] have presented an overview of the heat transfer characteristics of the flooded tube bundle evaporators and boiling on the outside tubes and tube bundles. In particular, the influence of tube position within a bundle of smooth tubes has been studied extensively for a variety of fluids, operating conditions, bundle layouts (in-line or staggered) and the tube spacing (pitch-to-diameter of 1.2-2) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. It has been well documented that upper tubes within the bundles can significantly increase nucleate boiling heat transfer than the lower tubes at low heat fluxes: this is referred to as the bundle effect.…”

Experimental investigation into effects of ultrasonic vibration on pool boiling heat transfer performance of horizontal low-finned U-tube in TiO2/R141b nanofluid

“…The use of such tubes not only minimizes the evaporator size, resulting in a lower initial cost and a smaller space requirement, but also increases the evaporation temperature, thereby improving the efficiency of the system. Hanne and Windisch [11] investigated the pool boiling heat transfer performance of R11 refrigerant for single tubes and twin tube arrangements, and found that the heat transfer on the upper tube of the twin tube arrangement was higher than that on the single tube, while the heat transfer on the lower tube was unaffected by the presence of the upper tube. Yu et al [12] showed that the presence of micro-fins induces an annular rather than wavy flow over the heated tube surface and improves the heat transfer performance by as much as 200 % under low mass flux conditions as a result.…”