Heat Transfer Performance in an Internally Dimpled Tube Heat Exchanger Composed of Various Materials Examined Using CFD: A Review
Abstract
A review of the most important findings for thermal enhancement on circular pipe is presented, the focus is on the heat transfer and thermal gradient in these heat exchangers. The use of circular dimpled pipes, surfaces, and other techniques to promote heat transmission has been the subject of several studies in the past. Reviews are conducted on a sizable number of research papers pertaining to computational and experimental investigations. Various characteristics, including Reynolds number (Re), geometric parameter, and nanofluids, have been discovered to impact flow and improve energy transfer in various configurations. The heat transfer of a flow impinging on a pipe has been the subject of just a few studies because of the pipe's intricate design, the use of many materials for its construction, and the difficulties in conducting a thorough experimental research. Profiles of the working nanofluid's mean velocity, turbulence rates, and heat transfer coefficients are often shown in investigations. It was found that, in comparison to a simple tube heat exchanger, the dimples enhanced the heat transfer coefficient of the pipe heat exchanger. Although the heat performance was greater than that of a plain pipe, a larger pressure loss was observed in comparison to plain pipe heat exchangers. For example, the dimples' size and location greatly affect the flow and thermal characteristics of the pipe. In this work, the thermal-hydraulic performance of dimpled tubes with different geometric pitches, two different types of helical pattern configurations (150 and 300) for the dimple structure, and six different dimple populations will be numerically investigated for a constant velocity under a constant external heat flux. The dimple pipe utilised in the simulation is built using three different sorts of materials. Due to their high heat conductivity, copper, aluminium, and cast iron are the materials for pipe used in the simulation.
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DOI: https://doi.org/10.37628/ijicegt.v9i2.1595
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