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The time periodic electroosmotic flow of Newtonian fluids through a semicircular microchannel is studied under the Debye-Hückel approximation. Analytical series of solutions are found, and they consist of a time-dependent oscillating part and a time-dependent generating or transient part. Some new physical phenomena are found. The electroosmotic flow driven by an alternating electric field is not periodic in time, but quasi-periodic. There is a phase shift between voltage and flow, which isdoi:10.18869/acadpub.jafm.67.221.22691 fatcat:e2qvkaxq2ba3hay7gj4vbwqaom