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All Journal International Journal of Evaluation and Research in Education (IJERE) TELKOMNIKA (Telecommunication Computing Electronics and Control) Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Jurnal Pendidikan Fisika FKIP UM Metro Gema Pendidikan Edu Sains: Jurnal Pendidikan Sains dan Matematika Jurnal Penelitian Pembelajaran Fisika Prosiding SNPF (Seminar Nasional Pendidikan Fisika) Jurnal Dedikasi Pendidikan Kasuari: Physics Education Journal (KPEJ) Jurnal Review Pendidikan dan Pengajaran (JRPP) Indonesian Review of Physics (IRiP) Ideguru: Jurnal Karya Ilmiah Guru Al-Tarbiyah: Jurnal Pendidikan (The Educational Journal)
Ishafit Ishafit
Universitas Ahmad Dahlan
Astronomy Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Theoretical Analysis of Thermal Equilibration in a Rotating Solid Sphere Partially Immersed in a Hot Fluid: A Study Inspired by the Onde Cooking Process Rodika Utama; Moh. Toifur; Ishafit Ishafit; Devi Farah Dina
Kasuari: Physics Education Journal (KPEJ) Vol. 9 No. 1 (2026): June 2026
Publisher : Universitas Papua, Jurusan Pendidikan Fisika FKIP Unipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37891/kpej.v9i1.1053

Abstract

This study presents a theoretical analysis of thermal equilibration in a sphere rotating with a constant angular velocity, where part of the sphere is submerged in a hot fluid and the other part is exposed to air. The model is inspired by the traditional onde-onde cooking process, which illustrates temperature equalization through continuous rotation during heating. By applying the steady-state heat equation in spherical coordinates and imposing boundary conditions representing two temperature regions (the hot fluid at T1 and the air at T2), the criterion for rotational equilibrium is obtained. The result shows that the angular velocity must satisfy the minimum threshold ωmin=k/ρcR2, where k is the thermal conductivity, ρ is the density, c is the specific heat, and R is the radius of the sphere. When the actual rotation rate exceeds this limit, the temperature distribution becomes nearly uniform, and the entire sphere approaches thermal equilibrium. The findings clarify the physical mechanism through which rotation enhances temperature uniformity in partially immersed solids. Beyond its culinary analogy, the model offers valuable insight for rotating heat exchangers, industrial drying systems, and thermal homogenization in composite materials.
Co-Authors Andrilana Andrilana Ani Susanti Butch O. Saulon Devi Farah Dina Dian Artha Kusumaningtyas Dian Artha Kusumaningtyas Dwi Sulisworo Furi Ningsih Sri Sukowati Hamid, Fatma Hamzah Hamzah Hikmah Mu’alimah Khairunnisa Khairunnisa Kristantiniati Kristantiniati Kurniasari, Efi Margi Sasono Maria Yosephien Retna Tinon Kawuri Marini Marini Moh. Irma Sukarelawan Moh. Toifur Muhammad Fikri Fauzi Novika Lestari Handayani Nurahman, Arip Rodika Utama Rosly Jaafar Rusli Adi Rusli Irwanto Sri Rezeki Sugiyarto Surono Suritno Fayanto Suritno Fayanto Syarifatun Niam Alfiani Toni Kus Indratno Ummu Habibatus Sholihah Widi Arief Sandria Widodo Widodo Wuryanto Puji Siswoyo Yoga Dwi Prabowo Zulfa Nidaul Hasanah