Experimental investigation of the effect of air bubbles injection on the performance of a plate heat exchanger

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

“…Efforts were taken in this study to investigate the impacts of ABI on both sides of water streams, i.e., CWS and HWS on the combined energetic-exergetic performance of C-PHE with a counterflow configuration. Moreover, compare the obtained results with the recently studied work [12] for the same C-PHE in the same operating conditions with a parallel fluid flow configuration. Hence, optimize the energy and exergy effectiveness using optimization techniques in order to identify the optimal operating conditions while injecting ABI.…”

“…This section discusses the obtained results from the experimental tests and compared them with the previously published article authored by Marouf et al [12]. Air was injected in four amounts (Q air ) of 150 L/h, 350 L/h, 630 L/h, and 840 L/h into CWS and HWS and seven (Q h ) varies from 280 to 880 L/h with an increasing flow step of 100 L/h, which corresponds to the channel Reynolds number (Re ch ) of 391, 530, 670, 809, 949, 1088, and 1227.…”

“…Moreover, a fixed hot temperature and cold-water flow rate of 50 • C and 290 L/h, respectively, that has a corresponding Re ch of 224, respectively. Marouf et al [12] studied the aforementioned tested parameters for parallel flow configuration with ABI into HWS without comparing their results for the case of ABI into CWS. The following terminology is used to facilitate calling the performed experimental test cases:…”

“…Hence, it received great attention, as there is no need to redesign, reinstall, or retrofit the system. Marouf et al [12] experimentally investigated the impacts of ABI on the HWS on the performance of C-PHE. Their study arranged with parallel flow direction with seven discharge hot water streams ranging from 280 L/h to 880 L/h and a constant amount of cold water of 290 L/h.…”

“…Furthermore, there are no attempts to compare ABI on both sides of water streams (HWS and CWS) with different fluid directions, i.e., counter and parallel flows. However, the recent investigation that focuses on studying the energetic and exergetic performance of C-PHE presented by Marouf et al [12] deals with ABI into the HWS with a parallel flow arrangement. Moreover, few research papers focus on the mechanisms of heat transfer due to ABI in PHE using visualization and simulation techniques without addressing the impacts on the energetic-exergetic performance of PHE [15][16][17][18][19].…”