The thermal management challenge of modern servers is recognized to arise from highly non-uniform power densities. In this study, a single-phase immersion and cold plate hybrid cooling method is employed to address the cooling of discretely distributed server elements with different power. Three-dimensional steady-state Reynolds-averaged Navier-Stokes simulations with conjugate heat transfer are performed to evaluate the thermal behavior of a complete one-unit server. Five coolant flow configurations are examined and their orientations relative to gravity are evaluated. The effects of coolant temperatures and flow rates as well as immersion liquid conditions are quantified through a systematic parametric analysis and an orthogonal design method. The dual inlet and dual outlet configuration provides the best temperature uniformity for the central processing unit. The inlet temperature of coolant is identified as the dominant factor for the maximum temperature of central processing units, while the overall temperature difference is mainly governed by the cooling configuration arrangement and the coolant flow rate. The temperature of low power elements is controlled primarily by the inlet temperature of the immersion liquid. A maximum temperature difference of 1.34 K is obtained for the platform controller hub. A reduction of 62.98 % compared with related work is demonstrated, and superior temperature uniformity is shown to be achieved by the proposed system. The combined cooling strategy is shown to maintain low temperature gradients across discrete power elements and is expected to provide theoretical support for the design of thermal management systems in modern servers.


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