@article{Kayser_da silva Ferrari_Goulart_2020, title={Measurements of convective heat transfer around a single rod bundle for three gap spacing}, volume={6}, url={https://periodicos.unb.br/index.php/ripe/article/view/35376}, abstractNote={<p><span class="fontstyle0">This work aims to evaluate the experimentally the convective heat transfer coefficient around a single rod<br />bundle under turbulent flow. The single rod bundle is part of a compound channel that is mainly characterized by<br />their dimensionless numbers such as the Reynolds number, and the </span><span class="fontstyle2">W/D </span><span class="fontstyle0">- ratio. The gap width, </span><span class="fontstyle2">δ, </span><span class="fontstyle0">is the distance<br />between the rod and the upper part of the channel. During the experimental campaign, the gap </span><span class="fontstyle2">δ </span><span class="fontstyle0">was changed its<br />width to 5, 10 and 15 mm, yielding a </span><span class="fontstyle2">W/D </span><span class="fontstyle0">= 1.05, 1.10 and 1.15, respectively. The dimension </span><span class="fontstyle2">W </span><span class="fontstyle0">is the sum of the gap<br />width, </span><span class="fontstyle2">δ</span><span class="fontstyle0">, and the cylinder’s diameter. The test section length was kept constant, 1800 </span><span class="fontstyle2">mm</span><span class="fontstyle0">. Special heated cell,<br />controlled by a Minipa 3305 Power Supply, was designed in order to keep cell`s surface heated. The temperature on<br />the cell`s surface was acquired through a set of special thermocouples on it. Afterwards, the wall temperature and<br />the local minima in terms of convective heat transfer coefficient around the tube was determine and compared with<br />those ones from the open literature. The J-data were found in fair agreement with those previously published.<br />Moreover, the J-data location was not found in the narrow gap for the smallest W/D studied, but for locations away<br />the gap (0°). When the gap becomes wider, the lowest local </span><span class="fontstyle3">h </span><span class="fontstyle0">returned to the narrow gap position. Hot-wire probe<br />was employed to measure the mean average and the turbulent velocity time traces at the gap vicinity. Coherent<br />structures were seen to dominate the flow at such region, affecting the J-data locus.</span> </p>}, number={2}, journal={Revista Interdisciplinar de Pesquisa em Engenharia}, author={Kayser, Fabio and da silva Ferrari, Jalusa Maria and Goulart, Jhon Nero Vaz}, year={2020}, month={dez.}, pages={1–9} }