Impact of reflection on the fluence rate distribution in a UV reactor with various inner walls as measured using a micro-fluorescent silica detector

► The impact of inner-wall reflection on FR distribution in a UV reactor was studied. ► Aluminum foil, stainless steel and black cloth were used as reflective materials. ► A highly reflective inner wall could markedly increase the weighted average FRs. ► Present models have an error of up to 35% for SS reactor if neglecting reflection. ► FR distribution uniformity depends on the inner-wall's diffuse reflection property.