Experimental and numerical studies of one-directional and bi-directional flow conditions across tube banks heat exchanger

Experimental Study on The Performance of One-Directional and Bi-Directional Flow Conditions Across In-Line Tube Banks Heat Exchanger

“…The purpose of the current investigation is to evaluate the effect of changing flow conditions on heat transfer performance across tube banks through experimental investigations. Earlier investigations confirmed that the bi-directional flow exhibits different velocity and temperature behaviors across the staggered tube banks heat exchanger compared to that of the one-directional flow condition [10,26,27]. The numerical results as shown in ref [27] provided insights into fluid dynamics aspect that supplement the experimental findings of [10].…”

“…Understanding complex cases require physical experimental investigations and it is important that it is done by benchmarking the well-known flow condition. Hence, this paper reported the investigation of the effect of onedirectional and bi-directional flows across an inline tube banks heat exchanger, which is a worthy addition to the results published by Hasbullah et al, [10,27]. In this paper, the heat transfer and flow across an in-line heat exchanger will be shown.…”

“…Earlier investigations confirmed that the bi-directional flow exhibits different velocity and temperature behaviors across the staggered tube banks heat exchanger compared to that of the one-directional flow condition [10,26,27]. The numerical results as shown in ref [27] provided insights into fluid dynamics aspect that supplement the experimental findings of [10]. Mikheev et al, carried out an experiment on the heat transfer performance of oscillating flow around a cylinder, and the findings showed that oscillation of an incoming flow might increase heat transfer [28].…”

“…In order to run the loudspeaker, the loudspeaker needs to be attached to the function generator (AFG 21005) and an amplifier (FLP-MT1201). Function generator is used to control the loudspeaker by setting up the input voltage while the frequency is kept at a constant value (14.2 Hz) which refers to the resonance frequency of the rig as reported in the earlier work [10,27]. For bi-directional flow condition, the end of the resonator is closed with a steel plate in order to create a standing wave bi-directional flow which complies with thermoacoustic's principle.…”

“…The air flow inside the resonator is induced by a loudspeaker. The air flow that is generated by the loudspeaker flows to the left during the first half of the cycle and then reverse to the right during the second half of the cycle to complete a full one cycle of bi-directional flow [27]. The flow repeats at a pace that depends on the resonance frequency of the flow.…”