Obtain a putative design for a vapor chamber lid for an electronic device; iteratively: obtain a steady state solution of governing equations of the putative design, wherein the governing equations include a thermal energy equation in a solid domain of the putative design and include continuity, momentum, and energy equations in vapor and liquid/wick domains of the putative design; modify the putative design in response to a difference between the evaporator temperature of the steady state solution and a threshold value for evaporator temperature; and obtain a new steady state solution of the governing equations for the putative design; and set a final design for the vapor chamber lid when a satisfactory result is obtained for the difference between the evaporator temperature and the threshold value for evaporator temperature.